γ-oxo-substituted allylic tin (1) having an aldehyde group at the terminus of the carbon chain proceeded in a stereocontrolled manner to give the 7-membered β-hydroxy cyclic ether (2a) with high diastereoselectivity. This method was applied for the synthesis of the 6·7·7·6 ring system (3a).
BF 3 .OEt 2介导的在碳链末端具有醛基的γ-氧代取代的烯丙基
锡(1)的分子内环化以立体控制的方式进行,得到了7元的β-羟基
环醚(2a)高非对映选择性。该方法被用于6·7·7·6环系统(3a)的合成。