Tryprostatin B was synthesized in 32% overall yield from the readily available dipeptide anhydride cyclo-(l-Trp-l-Pro). Its tandem C-3 prenylation/cyclization gave the corresponding pentacyclic pyrroloindole systems bearing a prenyl group at the indole C-3 position. These compounds were then submitted to acid-catalyzed opening of the newly formed ring, with concomitant migration of the prenyl group
从容易获得的二肽酸酐环-(1-Trp-1-Pro)合成Tryprostatin B,其总产率为32%。其串联的C-3异
戊烯基化/环化得到相应的在
吲哚C-3位置带有
异戊二烯基的五环
吡咯并
吲哚系统。然后将这些化合物置于新形成的环的酸催化的开环上,伴随
异戊二烯基团向
吲哚C-2位置的迁移。Tryprostatin B的丙
氨酸类似物也使用相似的序列制备。该策略的成功实施为沿着相似路线的胰
蛋白酶抑制素的
生物合成途径提供了条件。