Reactivity of cyclic sulfamidates towards sulfur-stabilised enolates. Stereocontrolled synthesis of functionalised lactams
作者:John F. Bower、Suda Chakthong、Jakub Švenda、Andrew J. Williams、Ron M. Lawrence、Peter Szeto、Timothy Gallagher
DOI:10.1039/b601804a
日期:——
A structurally representative series of 1,2- and 1,3-cyclic sulfamidates react with enolates derived from methyl α-phenylthioacetate 9b to give 5- and 6-substituted α-phenylthio lactams 20–24. These products provide, via the corresponding sulfoxides, an entry to α,β-unsaturated lactams e.g.12, 27, 29 and their α-phenylthio analogues e.g.26 and 30. With the enantiomerically pure 1,2-cyclic sulfamidates 10, 15 and 17, these reactions all proceed with no detectable loss of stereochemical integrity.
一系列结构上具有代表性的1,2-和1,3-环状硫酰胺与来源于甲基α-苯硫乙酸酯9b的烯醇盐发生反应,生成5-和6-取代的α-苯硫内酰胺20–24。这些产物通过相应的亚砜,为α,β-不饱和内酰胺(例如12、27、29)及其α-苯硫类似物(例如26和30)提供了一个合成途径。使用对映体纯净的1,2-环状硫酰胺10、15和17,所有这些反应均在没有可检测的立体化学完整性损失的情况下进行。