An easy synthesis of chiral sulfinyl allylic bromides and their use in the preparation of(R)S- and (S)S-2-p-tolylsulfinyl-1,3-alkadienes
摘要:
Condensation of (R)-vinyl-p-tolylsulfoxide anion on carbonyl compounds led directly to chiral allylic sulfinylalcohols 1. By treatment with NBS/Me2S, these alcohols 1 were converted into the rearranged primary allylic bromides 2 via SN2' displacement. Optically pure (R)- and (S)-2-p-tolylsulfinyl-1,3-alkadienes 3 resulted from the action of KOH/ROH upon these bromides 2 via E2' eliminations.