Asymmetric synthesis using enantiomerically pure 2-(p-anisylsulfinyl)-2-cycloalkenones
作者:Gary H. Posner、Leah L. Frye、Martin Hulce
DOI:10.1016/s0040-4020(01)82425-x
日期:1984.1
Conjugate additions of many organometallic reagents to 2-(p-anisylsulfinyl)-2-cycloalkenones, 2 proceed with much greater diastereoselectivity than additions to the corresponding 2-(p-tolylsulfinyl)-2-cycloalkenones, 7. Complexation of 2 with zinc dibromide followed by addition of various Grignard reagents lead, after reductive removal of the sulfoxide, to 3-substituted cycloalkanones of higher optical
许多有机金属试剂共轭增补2-(p -anisylsulfinyl)-2-环烯酮,2继续进行具有比添加到相应的2-(大得多非对映选择性p -tolylsulfinyl)-2-环烯酮,7。2与二溴化锌的络合,然后加入各种格氏试剂,在还原性除去亚砜后,导致3-取代的环烷酮的光学纯度高于从7中获得的环烷酮。在不存在二溴化锌的情况下,将甲基异丙醇三异丙氧基钛添加到2-(对-茴香基亚磺酰基)-2-环己烯酮2b中,几乎完全不对称地进行。