Regiocontrolled synthesis of cis-enediynes via intramolecular trapping of allylic cations
作者:Wei-Min Dai、Mavis Yuk Ha Lee
DOI:10.1016/s0040-4039(98)01834-6
日期:1998.10
Trapping of allylic cations possessing 1,2-dialkynyl groups by an external nucleophile such as ROH yields cis-enediynes in a regioselective manner; while similar allylic cations react with an internal nucleophilic group to afford exclusively cis-enediynes. This regiocontrolled allylic rearrangement has been used successfully in the synthesis of a number of 2,5-dihydro-2-benzofuryl cis-enediynes5 and
通过外部亲核试剂(例如ROH)捕获具有1,2-二炔基的烯丙基阳离子会以区域选择性的方式产生顺式-二烯炔。而类似的烯丙基阳离子则与内部亲核基团反应,仅生成顺式-二烯炔。这种区域控制的烯丙基重排已成功地用于合成许多2,5-二氢-2-苯并呋喃基顺式-烯二炔5和硫类似物。