Lithiated 3-tosylpropanal and 4-tosyl-2-butanone dimethyl acetals as β-acylvinyl anion equivalents for the synthesis of unsaturated 1,4-dicarbonyl compounds and α,β-butenolides
作者:Pedro Bonete、Carmen Nájera
DOI:10.1016/0040-4020(95)00026-5
日期:1995.2
chlorides affords, after p-toluenesulfinic acid elimination, ene-1,4-dicarbonyl compounds in a stereoselective manner. In the case of compound 7a, derived from acrolein, sequential monolithiation and reaction with carbonyl compounds give cyclic acetals, which after oxidation and elimination of p-toluenesulfinic acid are transformed into α,β-butenolides.
在对甲苯亚磺酸消除后,将1,1-二甲氧基-3-甲苯基丙烷(7a)和2,2-二甲氧基-4-甲苯基丁烷(7b)锂化,然后与酰氯反应,得到烯-1,4-二羰基立体选择性的化合物。在衍生自丙烯醛的化合物7a的情况下,顺序进行整体反应并与羰基化合物反应,得到环状缩醛,该缩醛在氧化和消除对甲苯磺酸后转化为α,β-丁烯内酯。