Synthesis of 6-substituted indolactams by microbial conversion
摘要:
New indolactam derivatives (24-27) with a fluorine, bromine, iodine or methyl group at position 6 of (-)-indolactam-V (1) were synthesized from corresponding seco-compounds (6-substituted N-methyl-L-valyl-L-tryptophanols) by the microbial conversion using Streptoverticilium blastmyceticum NA34-17. (-)-5-Fluoroindolactam-V (23) and (-)-7-methylindolactam-V (28) were similarly obtained by this method. (-)-6-Methylindolactam-V (27) had almost the same biological activities as (-)-7-methylindolactam-V (28), indicating that the substituent effect at position 6 of (-)-indolactam-V (1) is similar to that at position 7.
A practical synthesis of β-carbolines by tetra-n-butylammonium bromide (TBAB)-mediated cycloaromatization reaction of aldehydes with tryptophan derivatives
作者:Zhen Wang、Zhenzhen Yu、Yao Yao、Yakai Zhang、Xuefeng Xiao、Bin Wang
DOI:10.1016/j.cclet.2019.07.001
日期:2019.8
Abstract A mild and efficient nBu4NBr-mediated oxidative cycloaromatization to prepare β-carbolines from readily available tryptophans and aldehydes is described. The reaction is practical and allows the synthesis of β-carbolines on gram-scale. Some of products crystallized from the reaction mixture and were easily removed by filtration, obviating the need for chromatographic separation.
Direct intramolecular amination of tryptophan esters to prepare pyrrolo[2,3-b]indoles
作者:Zhao-Ying Yang、Tian Tian、Ya-Fei Du、Shi-Yi Li、Cen-Cen Chu、Lu-Ying Chen、Dan Li、Jia-Yi Liu、Bin Wang
DOI:10.1039/c7cc03983b
日期:——
A metal-free iodine-catalyzed intramolecular amination has been developed for the practical synthesis of pyrrolo[2,3-b]indoles from readily available tryptophan esters. The transformation has been applied to a wide array of substrates and can be performed on gram scale under very mild conditions.
已经开发了一种无金属的碘催化的分子内胺化方法,用于从容易获得的色氨酸酯中实际合成吡咯并[2,3- b ]吲哚。该转化已应用于各种各样的底物,并且可以在非常温和的条件下以克为单位进行转化。