Fj. Urban et al., SYNTHESIS AND STEREOCHEMISTRY OF SOME THIAZOLIDINES RELATED TO 6-(HYDROXYETHYL)-PENEMS, Tetrahedron : asymmetry, 5(2), 1994, pp. 215-222
L-Cysteine and D-penicillamine esters reacted with (R,R)- or ,S)-2-t-b
utyl-5-dimethylaminomethylene-6-methyl-[1 ,3]dioxan-4-one 3 to provide
thiazolidines with high stereospecificity. The major products were po
tential precursors for cis-beta-lactams.