Photoreactions of N-alkoxy-4-(p-chlorophenyl)thiazole-2(3H)-thiones with l-cysteine derivatives in aqueous solutions
作者:Jens Hartung、Rainer Kneuer、Kristina Špehar
DOI:10.1039/b101097m
日期:——
Photolysis of substituted N-alkoxythiazolethiones 1
in aqueous solvents furnishes alkoxyl radicals 2, which, upon
stereoselective 5-exo-trig cyclization, are trapped by water
soluble thiols (L-cysteine, L-cysteine ethyl ester,
or the reduced form of glutathione, GSH) to afford disubstituted
tetrahydrofurans 3 in synthetically useful yields and with satisfactory to
excellent diastereoselectivities.
inherent weakness of the N,O bond, leading to products of isomerization and rearrangement. In a third instance, methyl translocation from oxygen to sulfur occurred to furnish a heteroaromatic N-oxide at the expense of a cross conjugated π-system. Consistent X-ray crystallographic data sets served as a basis for electronic structure method assessment in order to model aspects relevant to structure and decomposition