Highly Efficient Syntheses of Alkyl 3,3-Dialkoxypropanoates, Alkyl 4-Ethoxy-2-oxo-3-butenoates, and Monoprotected Malonaldehydes
作者:Lutz-F. Tietze、Heinrich Meier、Edgar Voß
DOI:10.1055/s-1988-27541
日期:——
Haloform reaction of 4-alkoxy-1,1,1-trichloro-3-buten-2-ones, which can be obtained by acylation of enol ethers, gives 3,3-dialkoxypropanoic esters. Transacetalization of ethyl 3,3-diethoxypropanoate with 2,2-dimethyl-1,3-propanediol, followed by reduction and oxidation with DMSO/oxalyl chloride yields a monoprotected malonaldehyde. 4-Ethoxy-2-oxo-3-butenoates are synthesized either by acylation of enol ethers with alkoxalyl chlorides or by Claisen condensation of alkyl pyruvates with orthoesters.
4-烷氧基-1,1,1-三氯-3-丁烯-2-酮的卤仿反应,可通过烯醇醚的酰基化得到,生成3,3-二烷氧基丙酸酯。乙基3,3-二乙氧基丙酸酯与2,2-二甲基-1,3-丙二醇进行缩醛交换反应,随后用DMSO/草酰氯进行还原和氧化,得到单保护的苹婆醛。4-乙氧基-2-氧代-3-丁烯酸酯的合成,既可以通过烯醇醚与烷氧基草酰氯的酰基化反应,也可以通过烷基丙酮酸酯与原酸酯的克莱森缩合反应来实现。