Diastereoselective Alkylations of Chiral Tetrazolo[1,5-<i>a</i>]azepines via Heterobenzylic Anion Intermediates
作者:Collin H. Witt、K. A. Woerpel
DOI:10.1021/acs.orglett.2c02445
日期:2022.9.23
The alkylations of chiral seven-membered rings fused to tetrazoles are highly diastereoselective. The diastereoselectivity depended on the placement and the size of the substituent on the ring and on the electrophile. Subsequent alkylations occurred with high stereoselectivity, allowing for the construction of quaternary stereocenters. Computational studies revealed that torsional effects are responsible
与四唑稠合的手性七元环的烷基化具有高度非对映选择性。非对映选择性取决于环上取代基的位置和大小以及亲电子试剂。随后的烷基化以高立体选择性发生,从而可以构建四元立体中心。计算研究表明,扭转效应是观察到的非对映选择性的原因。取代产物可以还原为相应的仲胺,从而提供了合成非对映异构体富集的氮杂环庚烷的方法。