44. Diastereocontrolled Construction of Spiroindolenines via HFIP-Promoted Dearomative Epoxide–Indole Cyclization
Raju Chouhan, Hemanga Bhattacharyya and Sajal Kumar Das*
Org. Lett. 2024, 26, 1088–1093
Abstract PDF
Raju Chouhan, Hemanga Bhattacharyya and Sajal Kumar Das*
Org. Lett. 2024, 26, 1088–1093
Abstract PDF
43. Synthesis of benzimidazole-fused 1,4-benzoxazepines and benzosultams spiro-connected to a 2-oxindole core via a tandem epoxide-opening/SNAr approach
Abhijit Gogoi, Subhamoy Mukhopadhyay, Raju Chouhan and Sajal Kumar Das*
Org. Biomol. Chem. 2024, 22, 353-363
Abstract PDF
Abhijit Gogoi, Subhamoy Mukhopadhyay, Raju Chouhan and Sajal Kumar Das*
Org. Biomol. Chem. 2024, 22, 353-363
Abstract PDF
42. Studies on the synthesis of ammonificin A: New synthesis of trans-4-arylchroman-3-ols via intramolecular dehydrative Friedel–Crafts alkylation of 1,2-diols
Arup Jyoti Das and Sajal Kumar Das*
Tetrahedron. 2023, 144, 133576
Abstract PDF
Arup Jyoti Das and Sajal Kumar Das*
Tetrahedron. 2023, 144, 133576
Abstract PDF
41. An epoxide-opening cyclization/double Smiles rearrangement cascade approach to N-aryl-1,4-benzoxazines and N-arylindolines
Jonali Das, Abhijit Gogoi, Biraj Jyoti Borah and Sajal Kumar Das*
Org. Biomol. Chem. 2023, 21, 4755-4759
Abstract PDF
Jonali Das, Abhijit Gogoi, Biraj Jyoti Borah and Sajal Kumar Das*
Org. Biomol. Chem. 2023, 21, 4755-4759
Abstract PDF
40. Base-Mediated, Chemo- and Regioselective (4+2) Annulation of Indole-2-carboxamides with 2,3-Epoxy Tosylates toward 1,2-Fused Indoles
Arup Jyoti Das and Sajal Kumar Das*
Journal of Organic Chemistry 2023, 88, 9237-9248
Abstract PDF
Arup Jyoti Das and Sajal Kumar Das*
Journal of Organic Chemistry 2023, 88, 9237-9248
Abstract PDF
39. Trifluoroethanol-Mediated Cyclization of Two-Carbon-Tethered Epoxide–N-Boc Pairs: Completely Regioselective Synthesis of 3,6-Disubstituted 1,3-Oxazinan-2-ones
Jonali Das, Raju Chouhan, Hemi Borgohain, Biraj Jyoti Borah and Sajal Kumar Das*
Synthesis, 2023, 55, 2037-2046
Abstract PDF
Jonali Das, Raju Chouhan, Hemi Borgohain, Biraj Jyoti Borah and Sajal Kumar Das*
Synthesis, 2023, 55, 2037-2046
Abstract PDF
38. A small molecule potent IRAK4 inhibitor abrogates lipopolysaccharide-induced macrophage inflammation in-vitro and in-vivo
Saynaz A. Choudhary, Debarun Patra, Archana Sinha, Sayani Mazumder, Rajat Pant, Raju Chouhan, Anupam Nath Jha, Biswa Mohan Prusty, Debasis Manna, Sajal K. Das, Kulbhushan Tikoo, Durba Pal, Suman Dasgupta
European Journal of Pharmacology, 2023, 944, 175593
Abstract PDF
Saynaz A. Choudhary, Debarun Patra, Archana Sinha, Sayani Mazumder, Rajat Pant, Raju Chouhan, Anupam Nath Jha, Biswa Mohan Prusty, Debasis Manna, Sajal K. Das, Kulbhushan Tikoo, Durba Pal, Suman Dasgupta
European Journal of Pharmacology, 2023, 944, 175593
Abstract PDF
37. Diastereoselective Synthesis of Indoline- and Pyrrole-Embedded Tetracycles via an Unprecedented Dearomative Indole-C3-Alkylation/Aza-Friedel–Crafts Cascade Reaction
Raju Chouhan, Arup Jyoti Das and Sajal Kumar Das*
Journal of Organic Chemistry 2022, 87, 11534-11546
Abstract PDF
Raju Chouhan, Arup Jyoti Das and Sajal Kumar Das*
Journal of Organic Chemistry 2022, 87, 11534-11546
Abstract PDF
36. One-Pot Double Intramolecular Cyclization Approach to Tetralin-Based Cis-Fused Tetracyclic Compounds
Arup Jyoti Das and Sajal Kumar Das*
Journal of Organic Chemistry 2022, 87, 5085-5096 Abstract PDF
Arup Jyoti Das and Sajal Kumar Das*
Journal of Organic Chemistry 2022, 87, 5085-5096 Abstract PDF
35. Construction of Benzo‐Fused Heterocycles by Epoxide–Heteronucleophile Cyclization: Applications in the Synthesis of Natural Products and Designed Molecules
Jonali Das and Sajal Kumar Das*
European Journal of Organic Chemistry 2022, e202101034. Abstract PDF
Jonali Das and Sajal Kumar Das*
European Journal of Organic Chemistry 2022, e202101034. Abstract PDF
34. Construction of Benzosultam‐Containing Fused‐and Linked‐Biheterocycles by a Cascade Double Nucleophilic Cyclization
Arup Jyoti Das and Sajal Kumar Das* European Journal of Organic Chemistry 2022, e202101421. Abstract PDF
Arup Jyoti Das and Sajal Kumar Das* European Journal of Organic Chemistry 2022, e202101421. Abstract PDF
33. Regioselectivity of the SEAr-based cyclizations
and SEAr-terminated annulations of 3,5-unsubstituted,
4-substituted indoles
Jonali Das and Sajal Kumar Das*, Beilstein Journal of Organic Chemistry 2022, 18 , 293-302. Abstract PDF
and SEAr-terminated annulations of 3,5-unsubstituted,
4-substituted indoles
Jonali Das and Sajal Kumar Das*, Beilstein Journal of Organic Chemistry 2022, 18 , 293-302. Abstract PDF
32. Trifluoroethanol-promoted ring-opening
cyclization of 4-(2-oxiranylmethoxy)indoles: access
to 4,5-fused indoles
Jonali Das and Sajal Kumar Das*
Org. Biomol. Chem., 2021,19 , 6761-6765
Abstract PDF
cyclization of 4-(2-oxiranylmethoxy)indoles: access
to 4,5-fused indoles
Jonali Das and Sajal Kumar Das*
Org. Biomol. Chem., 2021,19 , 6761-6765
Abstract PDF
31. Hexafluoroisopropanol-Mediated Intramolecular Ring-
Opening Cyclization of Indolyl-N-Tethered Epoxides: Tether-
Length-Controlled Synthesis of 1,7- and 1,2-Fused Indoles
Arup Jyoti Das, Raju Chouhan, and Sajal Kumar Das*
J. Org. Chem. 2021, 86, 12, 8274–8285 Abstract PDF
Opening Cyclization of Indolyl-N-Tethered Epoxides: Tether-
Length-Controlled Synthesis of 1,7- and 1,2-Fused Indoles
Arup Jyoti Das, Raju Chouhan, and Sajal Kumar Das*
J. Org. Chem. 2021, 86, 12, 8274–8285 Abstract PDF
30. Base-mediated synthesis of benzimidazole-fused
1, 4-benzoxazepines via sequential intermolecular epoxide
ring-opening/intramolecular SNAr reactions
Runjun Devi, Subhamoy Mukhopadhyay, Arup Jyoti Das, and Sajal Kumar Das*
Teytrahedron Lett., 2020, 61, 152491 Abstract PDF
1, 4-benzoxazepines via sequential intermolecular epoxide
ring-opening/intramolecular SNAr reactions
Runjun Devi, Subhamoy Mukhopadhyay, Arup Jyoti Das, and Sajal Kumar Das*
Teytrahedron Lett., 2020, 61, 152491 Abstract PDF
29. Regioselectivity of the trifluoroethanol-promoted intramolecular N-Boc–epoxide cyclization towards 1, 3-oxazolidin-2-ones and 1,3-oxazinan-2-ones
Hemi Borgohain, Kankan Talukdar, Bipul Sarma and Sajal Kumar Das*
Org. Biomol. Chem., 2020,18, 7401-7413 Abstract PDF
Hemi Borgohain, Kankan Talukdar, Bipul Sarma and Sajal Kumar Das*
Org. Biomol. Chem., 2020,18, 7401-7413 Abstract PDF
28. Switching of regioselectivity in base-mediated diastereoselective annulation of 2,3-epoxy tosylates and their N-tosylaziridine analogs with 2-mercapto benzimidazole
Arup Jyoti Das, Hemi Borgohain, Bipul Sarma, and Sajal Kumar Das*
Org. Biomol. Chem., 2020,18, 441-449 Abstract PDF
Arup Jyoti Das, Hemi Borgohain, Bipul Sarma, and Sajal Kumar Das*
Org. Biomol. Chem., 2020,18, 441-449 Abstract PDF
27. Base-mediated intramolecular one-pot double-cyclization of epoxide-tethered 2-fluorobenzene- sulfonamides: an avenue to 1,4-benzoxazine-fused benzothiaoxazepine-1,1-dioxides
Jonali Das, Biraj Jyoti Borah, and Sajal Kumar Das* Org. Biomol. Chem., 2020,18, 220-224.
Abstract PDF
Jonali Das, Biraj Jyoti Borah, and Sajal Kumar Das* Org. Biomol. Chem., 2020,18, 220-224.
Abstract PDF
26. Synthesis of 11-aryl-11H-indeno[10,20:4,5] imidazo
[1,2-a]pyridines via dehydrative cyclization of aryl(2-arylimidazo[1,2-a]pyridin-3-yl)methanols
Hemi Borgohain and Sajal Kumar Das*
Tetrahedron Lett. 2019, 60, 2070-2073.
Abstract PDF
[1,2-a]pyridines via dehydrative cyclization of aryl(2-arylimidazo[1,2-a]pyridin-3-yl)methanols
Hemi Borgohain and Sajal Kumar Das*
Tetrahedron Lett. 2019, 60, 2070-2073.
Abstract PDF
25. Selective detection of fluoride via amplified donor-acceptor interaction of 6H-indolo[2,3-b]quinoline (Collaborative work with Dr. Sanjay Pratihar)
Rupa Pegu, Gopal Pandit, Ankur Kanti Guha, Sajal Kumar Das,* and Sanjay Pratihar*
Spectrochim Acta A Mol Biomol Spectrosc. 2019, 211, 246.
Abstract PDF
Rupa Pegu, Gopal Pandit, Ankur Kanti Guha, Sajal Kumar Das,* and Sanjay Pratihar*
Spectrochim Acta A Mol Biomol Spectrosc. 2019, 211, 246.
Abstract PDF
24. Boron trifluoride–etherate in fluorinated alcohols: A powerful promoter system for intramolecular alkyne–aldehyde metathesis of o-(3-arylpropargyloxy) benzaldehydes
Arup Jyoti Das, Runjun Devi and Sajal Kumar Das*
Tetrahedron Lett. 2018, 59, 4263.
Abstract PDF
Arup Jyoti Das, Runjun Devi and Sajal Kumar Das*
Tetrahedron Lett. 2018, 59, 4263.
Abstract PDF
23. Phenolate-induced intramolecular ring-opening cyclization of N-tosylaziridines: access to functionalized benzoxacycles
Runjun Devi, Jonali Das, Bipul Sarma, Sajal Kumar Das*
Org. Biomol. Chem. 2018, 16, 5846.
Abstract PDF
Runjun Devi, Jonali Das, Bipul Sarma, Sajal Kumar Das*
Org. Biomol. Chem. 2018, 16, 5846.
Abstract PDF
22. Combining spiro-fused cyclohexadienone–tetrahydrofuran ring system with glycine: Asymmetric synthesis of a new class of α-amino acid derivatives
Runjun Devi and Sajal Kumar Das*
Tetrahedron Lett. 2018, 59, 2281.
Abstract PDF
Runjun Devi and Sajal Kumar Das*
Tetrahedron Lett. 2018, 59, 2281.
Abstract PDF
21. Synthesis of Tetrahydroquinoline-Embedded Bridged Benzothiaoxazepine-1,1-dioxides
Hemi Borgohain, Runjun Devi, Divya Dheer, Biraj Jyoti Borah, Ravi Shankar, Sajal Kumar Das*
Eur. J. Org. Chem. 2017, 6671
Abstract PDF
Hemi Borgohain, Runjun Devi, Divya Dheer, Biraj Jyoti Borah, Ravi Shankar, Sajal Kumar Das*
Eur. J. Org. Chem. 2017, 6671
Abstract PDF
20. Studies Directed toward the Exploiation of Vicinal Diols in the Synthesis of (+)-Nebivolol Intermediates
Runjun Devi and Sajal Kumar Das*
Beilstein J. Org. Chem, 2017, 13, 571.
Abstract PDF
Runjun Devi and Sajal Kumar Das*
Beilstein J. Org. Chem, 2017, 13, 571.
Abstract PDF
19. Recent advances in the intramolecular reactions of epoxides with arenes and heteroarenes
Sajal Kumar Das*
Asian J. Org. Chem. 2017, 6, 243.
Abstract PDF
Sajal Kumar Das*
Asian J. Org. Chem. 2017, 6, 243.
Abstract PDF
18. cis-Diastereoselective synthesis of chroman-fused tetralins as B-ring-modified analogues of brazilin
Dimpee Gogoi, Runjun Devi, Pallab Pahari,
Bipul Sarma and Sajal Kumar Das*
(DG & RD contributed equally)
Beilstein J. Org. Chem. 2016, 12, 2816.
Abstract PDF
Dimpee Gogoi, Runjun Devi, Pallab Pahari,
Bipul Sarma and Sajal Kumar Das*
(DG & RD contributed equally)
Beilstein J. Org. Chem. 2016, 12, 2816.
Abstract PDF
17. Synthesis of diverse catechin congeners via diastereoselective intramolecular epoxy-arene cyclization
Runjun Devi, Dimpee Gogoi, Prerona Bora and
Sajal Kumar Das*
Tetrahedron 2016, 72, 4878.
Abstract PDF
Runjun Devi, Dimpee Gogoi, Prerona Bora and
Sajal Kumar Das*
Tetrahedron 2016, 72, 4878.
Abstract PDF
16. Brønsted acid-catalysed intramolecular ring opening of
2-(aryloxymethyl)-3-aryloxiranes leading to trans-4-aryl chroman-3-ols: scope and limitation
Runjun Devi, Tapasi Kalita and Sajal Kumar Das*
RSC Adv. 2015, 5, 39692.
Abstract PDF
2-(aryloxymethyl)-3-aryloxiranes leading to trans-4-aryl chroman-3-ols: scope and limitation
Runjun Devi, Tapasi Kalita and Sajal Kumar Das*
RSC Adv. 2015, 5, 39692.
Abstract PDF
FROM PH.D. AND POSTDOCTORAL WORK
15. Two-photon fluorescent probes for imaging of total sulfide in live cell and tissues, and quantitative estimation of total sulfide concentratation using the same
Bong Rae Cho, Chang Su Lim, Sajal Kumar Das, Sun Young Yang, Eun Sun Kim, Hoon Jai Chun
US patent number US9220794 B2, Publication date: 29.12.2015
14. Quantitative estimation of the total sulphide concentration in live tissues by two-photon microscopy
Chang Su Lim, Sajal Kumar Das, Sun Young Yang, Eun Sun Kim, Hoon Jai Chun, and Bong Rae Cho*
Anal. Chem. 2013, 85, 9288–9295. SKD and CSL equally contributed to this work.
13. A small molecule two-photon probe for hydrogen sulfide in live tissues
Sajal Kumar Das, Chang Su Lim, Sun Young Yang, Ji Hee Han and Bong Rae Cho*
Chem. Commun. 2012, 48, 8395-8397.
12. Aryl aryl methyl thio arenes prevent multidrug-resistant malaria in mouse by promoting oxidative stress in parasites
Manish Goyal, PriyankaSingh, Athar Alam, Sajal Kumar Das, Mohd Shameel Iqbal, Sumanta Dey, Samik Bindu, Chinmay Pal, Sanjit Kumar Das, Gautam Panda* and UdayBandyopadhyay*
Free Radic. Biol. Med. 2012, 53, 129.
11. Regioselective double Boekelheide reaction: first synthesis of 3,6-dialkylpyrazine-2,5-dicarboxaldehydes from DL-alanine
Sajal Kumar Das* andJoseph Frey*
Tetrahedron Lett. 2012, 53, 3869.
10. Asymmetric total syntheses of spisulosine and its diastreo- and regio-isomers
Subal Kumar Dinda, Sajal Kumar Das and Gautam Panda*
Tetrahedron, 2010, 66, 9304.
9. Formal total synthesis of (-)-Rhaphidecursinol B
Sanjit Kumar Das, Sajal Kumar Das and Gautam Panda*
Euro. J. Org. Chem. 2010, 5100.
8. A new synthetic route to unsymmetrical 9-arylxanthenes
Sajal Kumar Das, Ritesh Singh and Gautam Panda*
Euro. J. Org. Chem. 2009, 4757.
7. Application of phenolate ion-mediated intramolecular epoxide ring opening in the enantioselective synthesis of functionalized 2,3-dihydrobenzofuran and 1-benzopyran derivatives
Subal Kumar Dinda, Sajal Kumar Das and Gautam Panda*
Synthesis 2009, 1886.
6. Enantioselective synthesis of functionalized 1-benzoxepines by phenoxide ion mediated 7-endo-tet carbocyclization of cyclic sulphates
Sajal Kumar Das and Gautam Panda*
Euro. J. Org. Chem. 2009, 204.
5. Antiplasmodial Activity of [(Aryl)arylsulfanylmethyl]PyridineSanjay Kumar, Sajal Kumar Das, Sumanta Dey, Pallab Maity, Mithu Guha,Vinay Choubey, Gautam Panda*, and Uday Bandyopadhyay*
Antimicrob. Agents Chemother. 2008, 705.
4. beta-Hydroxy-alpha-tosyloxy esters as chiral building blocks for the enantioselective synthesis of benzoannulated oxa-heterocycles: scope and limitations
Sajal Kumar Das and Gautam Panda*
Tetrahedron 2008, 64, 4162.
3. Design, synthesis and antitubercular activity of diarylmethyl naphthol derivatives
Sajal Kumar Das, Gautam Panda*, Vinita Chaturvedi, Y.S. Manju, Anil N. Gaikwad and Sudhir Sinha
Bioorg. Med. Chem. Lett. 2007, 17, 5586.
2. Effect of substituents on diarylmethanes for antitubercular activity
Gautam Panda*, Maloy Kumar Parai, Sajal Kumar Das, Shagufta, Manish Sinha, Vinita Chaturvedi, Anil K. Srivastava, Y.S. Manju, Anil N.Gaikwad and Sudhir Sinha
Eur. J. Med. Chem. 2007, 42, 410.
1. An easy access to unsymmetric trisubstituted methane derivatives (TRSMs)
Sajal Kumar Das, Shagufta and Gautam Panda*
Tetrahedron Lett. 2005, 46, 3097.
15. Two-photon fluorescent probes for imaging of total sulfide in live cell and tissues, and quantitative estimation of total sulfide concentratation using the same
Bong Rae Cho, Chang Su Lim, Sajal Kumar Das, Sun Young Yang, Eun Sun Kim, Hoon Jai Chun
US patent number US9220794 B2, Publication date: 29.12.2015
14. Quantitative estimation of the total sulphide concentration in live tissues by two-photon microscopy
Chang Su Lim, Sajal Kumar Das, Sun Young Yang, Eun Sun Kim, Hoon Jai Chun, and Bong Rae Cho*
Anal. Chem. 2013, 85, 9288–9295. SKD and CSL equally contributed to this work.
13. A small molecule two-photon probe for hydrogen sulfide in live tissues
Sajal Kumar Das, Chang Su Lim, Sun Young Yang, Ji Hee Han and Bong Rae Cho*
Chem. Commun. 2012, 48, 8395-8397.
12. Aryl aryl methyl thio arenes prevent multidrug-resistant malaria in mouse by promoting oxidative stress in parasites
Manish Goyal, PriyankaSingh, Athar Alam, Sajal Kumar Das, Mohd Shameel Iqbal, Sumanta Dey, Samik Bindu, Chinmay Pal, Sanjit Kumar Das, Gautam Panda* and UdayBandyopadhyay*
Free Radic. Biol. Med. 2012, 53, 129.
11. Regioselective double Boekelheide reaction: first synthesis of 3,6-dialkylpyrazine-2,5-dicarboxaldehydes from DL-alanine
Sajal Kumar Das* andJoseph Frey*
Tetrahedron Lett. 2012, 53, 3869.
10. Asymmetric total syntheses of spisulosine and its diastreo- and regio-isomers
Subal Kumar Dinda, Sajal Kumar Das and Gautam Panda*
Tetrahedron, 2010, 66, 9304.
9. Formal total synthesis of (-)-Rhaphidecursinol B
Sanjit Kumar Das, Sajal Kumar Das and Gautam Panda*
Euro. J. Org. Chem. 2010, 5100.
8. A new synthetic route to unsymmetrical 9-arylxanthenes
Sajal Kumar Das, Ritesh Singh and Gautam Panda*
Euro. J. Org. Chem. 2009, 4757.
7. Application of phenolate ion-mediated intramolecular epoxide ring opening in the enantioselective synthesis of functionalized 2,3-dihydrobenzofuran and 1-benzopyran derivatives
Subal Kumar Dinda, Sajal Kumar Das and Gautam Panda*
Synthesis 2009, 1886.
6. Enantioselective synthesis of functionalized 1-benzoxepines by phenoxide ion mediated 7-endo-tet carbocyclization of cyclic sulphates
Sajal Kumar Das and Gautam Panda*
Euro. J. Org. Chem. 2009, 204.
5. Antiplasmodial Activity of [(Aryl)arylsulfanylmethyl]PyridineSanjay Kumar, Sajal Kumar Das, Sumanta Dey, Pallab Maity, Mithu Guha,Vinay Choubey, Gautam Panda*, and Uday Bandyopadhyay*
Antimicrob. Agents Chemother. 2008, 705.
4. beta-Hydroxy-alpha-tosyloxy esters as chiral building blocks for the enantioselective synthesis of benzoannulated oxa-heterocycles: scope and limitations
Sajal Kumar Das and Gautam Panda*
Tetrahedron 2008, 64, 4162.
3. Design, synthesis and antitubercular activity of diarylmethyl naphthol derivatives
Sajal Kumar Das, Gautam Panda*, Vinita Chaturvedi, Y.S. Manju, Anil N. Gaikwad and Sudhir Sinha
Bioorg. Med. Chem. Lett. 2007, 17, 5586.
2. Effect of substituents on diarylmethanes for antitubercular activity
Gautam Panda*, Maloy Kumar Parai, Sajal Kumar Das, Shagufta, Manish Sinha, Vinita Chaturvedi, Anil K. Srivastava, Y.S. Manju, Anil N.Gaikwad and Sudhir Sinha
Eur. J. Med. Chem. 2007, 42, 410.
1. An easy access to unsymmetric trisubstituted methane derivatives (TRSMs)
Sajal Kumar Das, Shagufta and Gautam Panda*
Tetrahedron Lett. 2005, 46, 3097.