Regioselective <i>cis</i>,<i>vic</i>-Dihydroxylation of α,β,γ,δ-Unsaturated Carboxylic Esters: Enhanced γ,δ-Selectivity by Employing Trifluoroethyl or Hexafluoroisopropyl Esters
作者:Reinhard Brückner、Joachim Schmidt-Leithoff
DOI:10.1055/s-2006-951473
日期:2006.9
The regioselectivity of Sharpless asymmetric dihydroxylation (AD) of α,β,γ,δ-unsaturated carboxylic esters was studied as a function of α-, β-, and δ-substituents and for fluorine-free versus fluorinated esters. The latter showed increased or complete γ,δ-selectivities: the hexafluoroisopropyl ester being superior to the trifluoroethyl ester. Olefinations of α,β-unsaturated aldehydes with phosphorus ylide 36 or phosphonate anion 41 provided α,β,γ,δ-unsaturated trifluoroethyl esters, leading inter alia to complete trans selectivity and to 31 with 94% E selectivity, respectively.
研究了 α、β、γ、δ-不饱和羧酸酯的 Sharpless 不对称二羟基化 (AD) 的区域选择性作为 α-、β- 和 δ- 取代基的函数以及无氟酯与氟化酯的关系。后者表现出增加的或完全的γ,δ-选择性:六氟异丙酯优于三氟乙酯。 α,β-不饱和醛与磷叶立德 36 或膦酸根阴离子 41 的烯化反应提供了 α,β,γ,β-不饱和三氟乙酯,尤其导致完全反式选择性和 31 分别具有 94% E 选择性。