Three-component regioselective carboamidation of 1,3-enynes via rhodium(III)-catalyzed C-H activation.

Rhodium-catalyzed regio- and stereoselective three-component carboamidation of 1,3-enynes has been realized using indoles and dioxazolones as the functionalizing reagents. A wide range of multi-substituted skipped 1,4-dienes have been constructed in good yields and excellent stereoselectivity. The stereoselectivity is under substrate control. 1,3-Enynes bearing a relatively bulky alkyne terminus reacted with -selectivity. In contrast, a sterically less hindered alkyne terminus tends to predominantly give the -configured skipped diene.