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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.
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Hartung et al. (2001) studied this question.
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