The invention of radical reactions. Part XXIII new reactions: Nitrile and thiocyanate transfer to carbon radicals from sulfonyl cyanides and sulfonyl isothiocyanates.
作者:Derek H.R. Barton、Joseph Cs. Jaszberenyi、Emmanouil A. Theodorakis
DOI:10.1016/s0040-4020(01)88524-0
日期:1992.3
Reaction of p-toluenesulphonyl cyanide or methanesulfonyl cyanide with carbon radicals, generated from the corresponding O-acyl-N-hydroxy-2-thiopyridone derivatives by visible light photolysis gives nitriles in good yield. The homolysis products of these sulfonyl nitriles can also be trapped by electron rich olefins. We have also found that carbon radicals react easily with mesyl or tosyl isothiocyanate
The group transfer radical addition of olefins with tosyl cyanide has been accomplished via visible light-induced organophotoredoxcatalysis. A diverse array of olefins is amenable to this protocol, furnishing β-sulfonyl nitriles with excellent efficiency under metal-free and redox-neutral conditions. A closed catalytic cycle is operative in this transformation, providing complementary reactivity to