作者:Dmitry Astashko、Hyung Goo Lee、Denis N. Bobrov、Jin K. Cha
DOI:10.1021/jo900823h
日期:2009.8.7
The stereochemistry of the Kulinkovich cyclopropanation of nitriles with alkenes has been examined by employing (E)-disubstituted alkenes and deuterium-labeled homoallylic alcohols as a stereochemical probe. An intramolecular cyclopropanation proceeds with preservation of the olefin configuration. On the other hand, intermolecular counterparts occur with both preservation and reversal of the olefin
通过使用 ( E )-二取代烯烃和氘标记的高烯丙醇作为立体化学探针,研究了腈与烯烃的 Kulinkovich 环丙烷化的立体化学。分子内环丙烷化在保持烯烃构型的情况下进行。另一方面,在形成环丙烷的步骤中,烯烃构型的保留和反转都会发生分子间对应物,这分别对应于 Ti-C 键处构型的保留和反转。这些不常见的立体化学结果与叔酰胺的 Kulinkovich 环丙烷化的结果形成对比。