Polyether Macrocycles from Intramolecular Cyclopropanation and Ylide Formation. Effect of Catalyst and Coordination
作者:Thomas M. Weathers、Yuanhua Wang、Michael P. Doyle
DOI:10.1021/jo0614902
日期:2006.10.1
The use of catalyticmetalcarbene methodology with diazoacetates for the construction in high yield of polyether macrocycles having ring sizes greater than 25 has been achieved by preventing access to γ-C−H positions for intramolecular insertion. Cyclopropanation is the exclusive outcome of reactions performed with dirhodium(II) catalysts, and product yields of greater than 70% are obtained without