Synthons for Polyketides: An Improved Synthesis of Methyl 3,3-Dialkoxy-2-methylpropanoates
作者:Robert D. Walkup、Nihal U. Obeyesekere
DOI:10.1055/s-1987-28021
日期:——
A versatile conversion of methyl methacrylate to methyl 3,3-dialkoxy-2-methylpropanoates proceeds via bromination, then treatment with excess sodium methoxide to yield methyl 3,3-dimethoxy-2-methylpropanoate, which can be transacetalized by treatment with alcohols under acid catalysis to yield the title compounds. Stereoselective chain-extension reactions of these compounds by aldol additions to the aldehydes derived from the ester group (C-1), or by titanium(IV)-mediated allylsilane additions to the acetal carbon (C-3), are examples of the potential utility of methyl 3,3-dialkoxy-2-methylpropanoates to natural products, syntheses.
甲基丙烯酸甲酯与 3,3-二烷氧基-2-甲基丙酸甲酯的多功能转化是通过溴化进行的,然后用过量的甲醇钠进行处理,生成 3,3-二甲氧基-2-甲基丙酸甲酯,在酸催化下用醇进行处理,生成标题化合物。3,3- 二烷氧基-2-甲基丙酸甲酯在天然产品合成中的潜在用途,可以通过酯基(C-1)衍生的醛的醛醇加成反应,或通过钛(IV)介导的烯丙基硅烷加成反应进行立体选择性链延伸反应。