Type II Anion Relay Chemistry: Exploiting Bifunctional Weinreb Amide Linchpins for the One-Pot Synthesis of Differentiated 1,3-Diketones, Pyrans, and Spiroketals
作者:Mark Farrell、Bruno Melillo、Amos B. Smith
DOI:10.1002/anie.201509342
日期:2016.1.4
effective bifunctional linchpins for type II anion relay chemistry (ARC) has been achieved. The mechanistically novel negative‐charge migration that comprises the Brook rearrangement is now initiated by a stabilized tetrahedral intermediate, which is generated by nucleophilic addition to a Weinreb amide, rather than by a simple oxyanion that is generated from an epoxide. As a result, the linchpin preserves
已经设计,合成和验证了用于II型阴离子继电化学(ARC)的新型高效双功能键针。现在,由布鲁克重排构成的机制新颖的负电荷迁移是由稳定的四面体中间体引发的,该中间体是通过亲核加成Weinreb酰胺而生成的,而不是由环氧化物生成的简单的氧阴离子。结果,该关键销保留了ARC加合物中的羰基官能度,从而允许在单个烧瓶中进入功能复杂的系统,而无需进一步的化学操作。可以根据亲核试剂,亲电试剂和后处理条件的选择,通过一锅法制备单保护的1,3-二酮以及吡喃和螺环骨架来验证该策略。