Synthesis of Optically Pure Clausenamine-A and its Demethoxylated Analogs
作者:Guoqiang Lin、Aimin Zhang
DOI:10.1016/s0040-4020(00)00634-7
日期:2000.9
total synthesis of Clausenamine-A (3) was developed involving the Suzuki cross-coupling and oxidativecoupling reaction. The synthesis of its demethoxylated analogs 1 and 2 were also reported. Resolution of (+)-1, (+)-2, (+)-3 and (−)-1, (−)-2, (−)-3 were performed via their corresponding camphorsulfonates of the racemates. The absolute configurations of (+)-1, (+)-2, (+)-3 and (−)-1, (−)-2, (−)-3 were
Bicyclic salicylates were prepared by [3+3] cyclization of 1,3-bis(silylenolethers) with cyclic 3-(silyloxy)alk-2-en-1-ones. Graphical Abstract Synthesis of Bicyclic Salicylates by [3+3] Cyclization of 1,3-Bis(SilylEnolEthers) with Cyclic 3-(Silyloxy)alk-2-en-1-ones
The first synthesis of optically pure biscarbazoles and determination of their absolute configurations
作者:Guoqiang Lin、Aimin Zhang
DOI:10.1016/s0040-4039(98)02346-6
日期:1999.1
Opticallypure dimeric O-demethylmurrayafoline A (1) and its 6,6′-dimethoxyl analog 2 were synthesized via the resolution of their corresponding camphorsulfonates of the racemates. The absolute configurations of (+) -1, (+) -2 and (−) -2 were assigned as (a R) and (a S), respectively, by the X-ray analysis and CD spectrum.
Clausenol and clausenine—two carbazole alkaloids from Clausena anisata
作者:A. Chakraborty、B.K. Chowdhury、P. Bhattacharyya
DOI:10.1016/0031-9422(95)00047-b
日期:1995.9
Two new carbazole alkaloids, designated as clausenol and clausenine, were isolated from an alcoholic extract of the stem bark of Clausenaanisata. Their structures were established as 1-hydroxy-6-methoxy-3-methylcarbazole and 1,6-dimethoxy-3-methyl carbazole, respectively, from physical and chemical evidence and synthesis. Clausenol was found to be active against Gram-positive and Gram-negative bacteria
Abstract Three carbazole alkaloids, glycozolicine, 3-formyl carbazole and glycosinine, have been isolated from the roots of Glycosmis pentaphylla . The structures of glycozolicine and glycosinine have been established as 5-methoxy-3-methyl carbazole and 2-methoxy-3-formyl carbazole, respectively, from physical and chemical evidence, and synthesis.