The palladium-catalyzed coupling of the vinyldisiamylborane, formed in situ, affords the isocoumarins which can be used further for the synthesis of radicicol and related macrolides, in 72% global overall yield from the alkyne. Advantages over related vinylboronates or vinyltin couplings are discussed in the case of the present examples.
原位形成的
乙烯基二亚
氨基
硼烷的
钯催化偶联提供了异
香豆素,其可以进一步用于合成
紫杉醇和相关的大环
内酯类,
炔烃的全球总产率为72%。在本实施例的情况下,讨论了相对于相关的
乙烯基硼酸酯或
乙烯基锡偶联剂的优点。