Preparation of alkyl 3-methylalka-2,4-dienoates from γ,δ-unsaturated β-keto esters via the corresponding conjugated unsaturated 3-enol phosphates
作者:Cornelis M. Moorhoff、David F. Schneider
DOI:10.1016/s0040-4020(98)00071-4
日期:1998.3
Methylation of α,β,γ,δ-unsaturated-β-substituted enol phosphates with lithium dimethyl cuprate gave a mixture of (2E,4E)- and (2Z,4E) alkyl 3-methylalka-2,4-dienoates and unsubstituted alkyl alka-2,4-dienoates. An improved synthesis is described for ethyl β-safranate and the insect growth regulator hydroprene.
α,β,γ,δ-不饱和-β-取代的烯醇磷酸盐与二甲基铜酸锂的甲基化得到(2 E,4 E)-和(2 Z,4 E)烷基3-甲基烷基-2,4-的混合物二烯酸酯和未取代的烷基2,4-二烯酸酯。描述了β-氨基磺酸乙酯和昆虫生长调节剂丁二烯的改进的合成方法。