A Tandem Reduction-Oxidation Protocol for the Conversion of 1-Keto-1,2,3,4-tetrahydrocarbazoles to Carbazoles via Tosylhydrazones through Microwave Assistance: Efficient Synthesis of Glycozoline, Clausenalene, Glycozolicine, and Deoxycarbazomycin B and th
作者:Suchandra Chakraborty、Gautam Chattopadhyay、Chandan Saha
DOI:10.1002/jhet.999
日期:2013.1
methodology for the synthesis of carbazoles from 1‐keto‐1,2,3,4‐tetrahydrocarbazoles via the corresponding tosylsulfonhydrazones by a one‐pot tandem reduction–oxidation protocol using a combination of NaBH4 and Pd–C on MgSO4·7H2O, a solidsupport, under microwave is developed. The reaction is successfully extended toward the synthesis of several naturally occurring carbazole alkaloids, namely 3‐methylcarbazole
Total Synthesis of Marine Alkaloid Hyellazole and its Derivatives
作者:Suchandra Chakraborty、Chandan Saha
DOI:10.1002/ejoc.201800187
日期:2018.5.8
The synthesis of the marine alkaloid hyellazole, based on a carbazole moiety, was achieved by means of classic Fischer indole cyclization with a synthesized appropriately substituted bromoaniline and subsequent use of Suzuki–Miyaura cross‐coupling with phenylboronic acid in the presence of a palladium catalyst.
A novel CAN-SiO2-mediated one-pot oxidation of 1-keto-1,2,3,4-tetrahydrocarbazoles to carbazoloquinones: Efficient syntheses of murrayaquinone A and koeniginequinone A
作者:Suchandra Chakraborty、Gautam Chattopadhyay、Chandan Saha
DOI:10.1002/jhet.561
日期:2011.3
1‐keto‐1,2,3,4‐tetrahydrocarbazoles (1) to carbazole‐1,4‐quinones (2) are efficiently carried out by CAN‐SiO2‐mediated reaction. This generalized protocol was successfully extended to the synthesis of two naturally occurring carbazoloquinones: murrayaquinone A (2b) and koeniginequinone A (2g). A plausible mechanism for this novel reaction involves formation of a 9‐hydroxy‐2,3,4,9‐tetrahydro‐1H‐carbazole‐1‐one