Copper(I)-Catalyzed Intramolecular Asymmetric [2 + 2] Photocycloaddition. Synthesis of Both Enantiomers of Cyclobutane Derivatives
作者:Niladri Sarkar、Abhijit Nayek、Subrata Ghosh
DOI:10.1021/ol049696h
日期:2004.6.1
[reaction: see text] A simple approach for asymmetric induction in Cu(I)-catalyzed [2 + 2] photocycloaddition, where asymmetric catalysts or chiral auxiliaries were inefficient, has been developed using the concept of chirality transfer from the readily available 2, 3-di-O-cyclohexylidine-(R)-(+)-glyceraldehyde. An anion-induced cleavage of the tetrahydrofuran ring of the resulting oxa-bicyclo[3.2
[反应:请参阅文字]使用手性转移的概念,从现成的2中开发了一种简单的方法,用于在Cu(I)催化的[2 + 2]光环加成中进行不对称诱导,其中不对称催化剂或手性助剂的效率很低。 3-二-O-环己啶-(R)-(+)-甘油醛。阴离子诱导的氧杂双环[3.2.0]庚烷的四氢呋喃环的裂解导致方便地获得对映体纯形式可用于合成的顺式1,2-二取代环丁烷。