Cs. Rao et al., CHEMOSELECTIVE CONJUGATE 1,4-REDUCTION OF ALPHA-OXOKETENE DITHIOACETALS WITH ZINC IN ACETIC-ACID - SYNTHESIS OF BETA-OXODITHIOACETALS, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 35(1), 1996, pp. 57-59
Acyl ketene dithioacetals 1 and 3 undergo highly chemoselective conjug
ate 1,4-reduction with zinc in acetic acid to give beta-oxodithioaceta
ls 2 and 4 in high yields.