High pressure mediated IMDAF of the αâ²-benzylthiofuran substrate 1 results in efficient and highly stereoselective cycloaddition; subsequent epimerisation of the cycloadduct 6 is regiospecific and the oxygen bridge may be opened by elimination or hydrolysis.
高压介导的α-苄基
硫呋喃底物 1 的 I
MDAF 导致高效且高度立体选择性的环加成反应;随后环加合物6的差向异构化是区域特异性的并且氧桥可以通过消除或
水解打开。