The catalytic asymmetric hydrogenation of enol esters with a vinyllic or acetylenic substituent proceeds with extremely high enantioselectivity using a Rhodium-chiral bisphosphine catalyst. This is at variance with the hydrogenation of enol esters bearing a saturated substituent, which are hydrogenated with only marginal enantioselectivity under the same conditions.
使用
铑手性
双膦催化剂对具有
乙烯基或
乙炔基取代基的烯醇酯进行催化不对称氢化,具有极高的对映选择性。这与饱和取代基烯醇酯的氢化不同,在相同条件下,饱和取代基烯醇酯的氢化只有很小的对映选择性。