作者:Manfred Schlosser、Sven Strunk
DOI:10.1016/s0040-4020(01)80095-8
日期:1989.1
If the rearrangement of metalated allyl ethers 2 (or 4) is accomplished in the presence of potassium tert-butoxide, primary alkyl groups preferentially migrate to the unsubstituted allylic terminus (γ-position). Enolates 7 and 1-vinylalcoholates 6 (by alkyl migration to the α-position, adjacent to the oxygen atom) are produced in an approximate ratio of 9:1. Because of the endo-configuration of their
如果金属化的烯丙基醚2(或4)的重排在叔丁醇钾的存在下完成,则伯烷基优先迁移至未取代的烯丙基末端(γ位置)。烯醇酸酯7和1-乙烯基醇酸酯6(通过烷基迁移至与氧原子相邻的α-位)以大约9∶1的比例产生。由于其有机金属前体的内构型,烯醇盐仅以(Z)构型出现,如用三甲基氯硅烷捕获并分离所得的O-甲硅烷基(Z)-醚。后者的水解以良好的产率提供了相应的醛。—从机械角度来看,重新排列仍然很模糊。协调一致的过程是主要的反应方式是不可能的。暂时建议两性离子金属单体18和溶剂笼蔽的自由基对17的中间产物。