Enantioselective preparation of 1,3-dithiane 1-oxides by asymmetric oxidation of 1,3-dithianes bearing a chiral auxiliary
作者:Yoshihiko Watanabe、Yojiro Ono、Shigefumi Hayashi、Yoshio Ueno、Takeshi Toru
DOI:10.1039/p19960001879
日期:——
Oxidation of 1,3-dithianes bearing a chiral auxiliary derived from (+) or (–)-camphor or diacetone D-(+)-glucose by the Sharpless reagent [Ti(OPri)4–diethyl L-(+)- or D-(–)-tartrate-ButOOH] affords, with high stereoselectivity, the monosulfoxides in good to excellent yields. Removal of the chiral auxiliary by base-catalysed hydrolysis yields (R)- and (S)-1,3-dithiane 1-oxides in high yields.
的1,3-二噻烷轴承氧化手性助剂选自(+)或衍生的( - ) -樟脑或双丙酮d - (+) -葡萄糖由夏普勒斯试剂钛[Ti(OPR我)4 -二乙基大号- (+) -或d - ( - ) -酒石酸盐卜吨] OOH得到,具有高的立体选择性,以良好至优异的产率的monosulfoxides。通过碱催化的水解除去手性助剂以高收率产生(R)-和(S)-1,3-二硫杂环丁烷1-氧化物。