New approach to asymmetrically substituted methoxypyrazines, derivatives of wine flavors
作者:Nicolas Candelon、Svitlana Shinkaruk、Bernard Bennetau、Catherine Bennetau-Pelissero、Marie-Laurence Dumartin、Marie Degueil、Pierre Babin
DOI:10.1016/j.tet.2010.01.088
日期:2010.3
original synthetic route to asymmetrically substituted methoxypyrazine (MP) derivatives is described. The first step of the synthesis is achieved by condensation of 1,2-aminoalcohols with Boc-protected aliphatic aminoacids followed by cycloimine formation and aromatization via chlorination. Introduction of methoxy group was then achieved by alkoxy-de-halogenation. The use of primary or secondary aminopropanol
描述了合成不对称取代甲氧基吡嗪(MP)衍生物的原始方法。合成的第一步是将1,2-氨基醇与Boc保护的脂族氨基酸缩合,然后形成环亚胺并通过氯化进行芳构化。然后通过烷氧基脱卤化作用引入甲氧基。伯或仲氨基丙醇的使用使得能够将甲基容易地官能化地直接和选择性地引入5-或6-位的甲基。由l-缬氨酸和l制备的二酮哌嗪的芳构化-谷氨酸二甲基酯使得直接引入官能化的烷基链成为可能。这些反应也适用于天然MP的合成,例如葡萄酒风味成分和生物活性物质。