Development of an Intramolecular Aryne Ene Reaction and Application to the Formal Synthesis of (±)-Crinine
作者:David A. Candito、Dennis Dobrovolsky、Mark Lautens
DOI:10.1021/ja306881u
日期:2012.9.19
A general and high yielding annulation strategy for the synthesis of various carbo- and heterocycles, based on an intramolecular aryne ene reaction is described. It was found that the geometry of the olefin is crucial to the success of the reaction, with exclusive migration of the trans-allylic-H taking place. Furthermore, the electronic nature of the aryne was found to be important to the success
Rearrangement of cyclopropyl methanesulfonates to allylic carbocations was employed for the construction of tetralin and chromate bicyclic cores. We found that this transformation proceeds efficiently and rapidly at room temperature in the presence of dimethylaluminium triflate serving as a non-nucleophilic Lewis acid. The reaction begins with the cyclopropanol ring-opening and follows by the Friedel-Crafts