The antineoplastic agent (−)-metachromin A (1) from Hippospongia metachromia has been synthesized in enantiomerically pure form in 13% overall yield. A general convergent synthetic strategy for different metachromins using a 2-alkyloxy-3-sulfonyl-1,3-oxazolidine as a chiral dithienium equivalent is presented.
来自 Hippospongia metachromia 的抗肿瘤剂 (-)-metachromin A (1) 以对映体纯形式合成,总产率为 13%。提出了使用 2-烷氧基-3-磺酰基-1,3-恶唑烷作为手性二噻吩等价物的不同异色胺的一般收敛合成策略。