The 2-phenylsulfonyl allylic bromides add diastereoselectively to various aldehydes in the presence of zinc or of in situ generated chromium (II) salts to give mainly the syn-hydroxy sulfones in high yields. The sulfone can be easily transformed into the diastereomerically pure γ-pivaloyloxy ketone allowing a complete control of the stereochemistry of four adjacent chiral centers in an acyclic compound
2-苯基磺酰基烯丙基
溴化物在
锌或原位生成的
铬(II)盐的存在下非对映选择性地添加到各种醛中,从而以高收率主要得到合成羟基砜。砜很容易转化为非对映体纯的γ-新戊酰氧基酮,可以完全控制无环化合物中四个相邻手性中心的立体
化学。