Tether-enforced reversal of regioselectivity: head-to-head [4 + 4] photocycloaddition of 2-pyridones
作者:Scott McN. Sieburth、Brian Siegel
DOI:10.1039/cc9960002249
日期:——
Symmetric 3,3′-attachment of a three-atom chain between two pyridones overrides the head-to-tail regioselectivity found in intermolecular photodimerization reactions and gives a nearly quantitative yield of the head-to-head [4 + 4] cycloadduct containing contiguous quaternary centres.
两个吡啶酮之间的三原子链的对称 3,3'-连接克服了分子间光二聚反应中发现的头对尾区域选择性,并给出了包含连续环的头对头 [4 + 4] 环加合物的几乎定量产率第四纪中心。