An efficient stereocontrolled synthesis of the C-ring fragment of cobyricacid 1 is described. The key step is an auxiliary controlled conjugate addition of vinyl cuprate to (5S)-menthyloxy-2[5H]-furanone 3.
描述了高效高效立体合成Cobyric acid 1的C环片段。关键步骤是将铜酸乙烯酯辅助控制的共轭加成到(5 S)-薄荷氧基-2 [5 H ]-呋喃酮3中。