作者:Zhi-wei Guo、Koji Machiya、Grzegorz M. Salamonczyk、Charles J. Sih
DOI:10.1021/jo9721204
日期:1998.6.1
A chemoenzymatic strategy has been developed for the synthesis of bastadins 2, 3, and 6. The requisite dimeric dityrosine and isodityrosine building blocks were successfully prepared by oxidative C-C and C-O phenolic coupling of mono- and dihalogenated derivatives of tyrosine and tyramine using horseradish and soybean peroxidases. By carefully controlling the experimental parameters, the requisite synthons may now be prepared in synthetically useful yields without the exhaustive protection and deprotection of the sensitive functional groups.
Efficient total synthesis of bastadin 6, an anti-angiogenic brominated tyrosine-derived metabolite from marine sponge
An efficient total synthesis of bastadin6 (1), a cyclic tetramer of brominated tyrosine derivatives from the marinesponge, Ianthella basta, with selective anti-angiogenic activity, was accomplished. We developed a novel Ce(IV)-mediated oxidative coupling reaction of 2,6-dibromophenols to give the diaryl ether derivatives, the characteristic segment of 1. Condensation of two segments and subsequent