Facile approach towards the synthesis of homochiral functionalised alcohols from 4-O-[(tert)-butyldimethylsilyl]-2,3-O-cyclohexylidene-l-threose of (l)-(+)-tartaric acid origin
作者:Angshuman Chattopadhyay、Bhaskar Dhotare
DOI:10.1016/s0957-4166(98)00282-1
日期:1998.8
(l)-(+)-Diethyl tartarate 2 has been transformed into the aldehyde 6. Grignard additions to 6 take place with moderate diastereoselectivity giving predominant formation of the anti products 8a–e. However, in each case the diastereoalcohols are easily separable by column chromatography giving rise to the formation of a series of functionalised homochiral alcohols 7 and 8. On the other hand Zn mediated allylation
(l)-(+)-酒石酸二乙酯2已转化为醛6。格利雅(Grignard)向6中添加时具有适度的非对映选择性,从而主要形成抗产物8a - e。然而,在每种情况下,非对映醇很容易通过柱色谱法分离,从而导致形成一系列官能化的均手性醇7和8。另一方面,在水存在下,Zn介导的6的烯丙基化和炔丙基化有效地进行,几乎完全(> 99%)立体选择性形成了多功能官能化均聚物8d和均丙8e醇。