Lactate as chiral auxiliary in asymmetric photodeconjugation of unsaturated esters
作者:James L. Charlton、Vinh C. Pham、Jean-Pierre Petie
DOI:10.1016/s0040-4039(00)60009-6
日期:1992.10
The asymmetric photodeconjugation of the α,β-unsaturated esters 1, 2 and 3, to the, corresponding β,γ-unsaturated esters having a new chiral center at the α position, has been studied in a variety of solvents. In most solvents, the (S)-lactyl chirnal auxiliary induced the S configuration at the new chiral center. However, irradation of 1 in methanol or 2-propanol/water mixtures gave an unusual reversal
该α,β不饱和酯的不对称photodeconjugation 1,2和3,对,相应β,在α位置上的新的手性中心γ不饱和酯,已经研究了在各种溶剂中。在大多数溶剂中,(S)-乳糖基手性助剂在新的手性中心诱导了S构型。然而,在甲醇或2-丙醇/水混合物中辐照1会产生非对映的非对映选择性,从而在新的手性中心产生R构型。