Fluoroalkylated α,β-Unsaturated Imines: Efficient and Versatile Substrates for the Synthesis of Fluorinated Vinylogous β-Amino Esters and 3,4-Dihydropyridin-2-ones
作者:Francisco Palacios、Ana M. Ochoa de Retana、Sergio Pascual、Guillermo Fernández de Trocóniz、José M. Ezpeleta
DOI:10.1002/ejoc.201000948
日期:2010.12
4-dihydropyridin-2-ones (8c–h) by conjugate (1,4-) addition of enolates derived from α-mono- and α,α-disubstituted esters. Fluoroalkylated β-amino esters (4, 9) and 3,4-dihydropyridin-2-ones (6, 8, 10) were also prepared by the olefination of enaminophosphonate 2 with BuLi, addition of aldehydes and subsequent addition of the enolates derived from esters 3.
通过来自乙酸烷基酯或丙二酸二乙酯的烯醇与氟烷基化 α,β-不饱和亚胺 (1) 的区域选择性 1,2-加成反应,简单有效地合成乙烯基氟烷基化 β-氨基单 (4) 和二酯 (9) 衍生物 (1)被描述。这些氟化亚胺 (1) 用作区域选择性合成含氟 trans-3,4-dihydropyridin-2-ones (6, 8a, 8b, 10) 和 3,3-spiro-3,4-dihydropyridin 的中间体-2-ones (8c-h) 通过共轭 (1,4-) 添加衍生自 α-单-和 α,α-二取代酯的烯醇。氟烷基化 β-氨基酯 (4, 9) 和 3,4-二氢吡啶-2-ones (6, 8, 10) 也通过烯氨基膦酸酯 2 与 BuLi 的烯化、醛的加成和随后的烯醇化物的加成来制备酯类 3.