ChemInform Abstract: Catalytic Asymmetric [4 + 1] Annulation of Sulfur Ylides with Copper—Allenylidene Intermediates.

Abstract

Copper(II) triflate/(R,R)‐Pybox has been used as catalytic system in the synthesis of 1‐tosyl‐2‐acyl‐3‐ethynylindolins in high yields and excellent dia‐ and enantioselectivities form corresponding acylsulfur ylides and 4‐ethynyl‐1‐tosyl‐1,4‐dihydro‐2H‐benzo[d][1,3]oxazin‐2‐ones.