作者:Almudena Rubio、Jesús Ezquerra、Ana Escribano、Modesto Jesús Remuiñán、Juan José Vaquero
DOI:10.1016/s0040-4039(98)00166-x
日期:1998.4
The total synthesis of (−)-α-Kainic Acid 1 has been accomplished using ethyl N-Boc-pyroglutamate 2 as starting material. The isopropenyl appendage was achieved from the elimination of the dimethylcarbinol introduced at C-4 via an aldol condensation of the lactam enolate of 2 and acetone. The acetate group at C-3 of the kainic acid structure was introduced via diethyl malonate Michael addition reaction
已经使用N-Boc-焦谷氨酸乙酯2作为起始原料完成了(-)-α-Kainic酸1的全合成。异丙烯基附接物是通过消除内酰胺烯醇酸酯2和丙酮在C-4引入的在C-4处引入的二甲基甲醇而获得的。通过丙二酸二乙酯迈克尔加成反应将海藻酸结构的C-3处的乙酸基引入到2,3-二氢氢化脯氨酸8。该迈克尔加成反应在对新产生的立体异构中心进行完全立体控制的情况下进行。9中C-3处的配置反转通过双键形成,随后的氢化,中性脱羧以及C-2立体异构中心在12中的进一步差向异构化,产生了所需的天然产物。