Enantiospecific Synthesis of 5-Methoxy-D(+)- OR L(-) Tryptophan
作者:Puwen Zhang、James M. Cook
DOI:10.1080/00397919508011464
日期:1995.12
Abstract A method for the enantiospecificsynthesis of 5-methoxy-D(+)-tryptophan 8 or the L(-)-optical antipode is described. This procedure can be scaled up and performed without the need for extensive chromatographic separations. It provides for the first time the synthesis of the optically pure 5-methoxy-D(+) or L(-)-tryptophans required for alkaloid total synthesis.
Enantiospecific Synthesis of Optically Active 6-Methoxytryptophan Derivatives and Total Synthesis of Tryprostatin A<sup>1</sup>
作者:Tong Gan、Ruiyan Liu、Peng Yu、Shuo Zhao、James M. Cook
DOI:10.1021/jo971640w
日期:1997.12.1
A concise preparation of optically active L or D-6-methoxytryptophan ethyl ester 21 was developed via the Fischer indole/Schollkopf protocol from 6-methoxy-3-methylindole 16 (four steps, 58% overall yield). This method was extended to the enantiospecific total synthesis of tryprostatin A (11) via a regiospecific bromination process as a key step. In addition, 6-methoxy-2-bromotryptophan ethyl ester (32), a potential intermediate for indole alkaloid synthesis, was prepared via this strategy.