作者:Raymond L. Funk、Matthew M. Abelman、John D. Munger
DOI:10.1016/s0040-4020(01)90572-1
日期:——
Macrocyclic ketene acetals 3 undergo Claisen rearrangements smoothly and constitute a viable and general approach to hetero- or carbocyclic ring systems 4. This novel ring contraction process is subject to high internal asymmetric induction (cf. lactones 7 → carbocycles 8) as well as relative asymmetric induction in the rearrangements of ketene acetals derived from lactones 18, 23 and 27. Finally,
大环烯酮缩醛3平稳地经历了克莱森重排,并构成了杂或碳环体系4的可行且通用的方法。这种新颖的环收缩处理是经受高内部不对称诱导(参见内酯7 →碳环8),以及相对的不对称诱导在烯酮缩醛的由内酯衍生的重排18,23和27。最后,制备了N-苯甲酰基间苯二甲基甲酯(37),以证明该方法在杂环合成中的潜力。