The synthesis and the nuclear magnetic resonance study of β-lactam derivatives of 1,5-benzothiazepines
作者:Aron Szöllösy、George Kotovych、Gábor Tóth、Albert Lévai
DOI:10.1139/v88-047
日期:1988.2.1
The synthesis and stereochemistry of seven β-lactam derivatives of 1,5-benzothiazepines are presented. The configurational and conformational analysis is based on nuclear Overhauser effect experiments, together with analysis of the vicinal proton–proton coupling constants. In the preferred conformation, the seven-membered ring is in a half-chair. Only for one compound, 2-aza-4-bromo-4-methyl-5,7-d
介绍了 1,5-苯并硫氮杂的七种 β-内酰胺衍生物的合成和立体化学。构象和构象分析基于核 Overhauser 效应实验以及邻位质子-质子耦合常数的分析。在优选的构象中,七元环处于半椅子中。仅对于一种化合物 2-aza-4-bromo-4-methyl-5,7-diphenyl-8-thiatricyclo[7.4.0.02,5]trideca-Δ1,9,10,12-trien-3-one,分离出两种非对映异构体(化合物 6a 和 6b)。其中六种化合物具有 4S*、5R*、7R* 构型,而化合物 6b 具有 4R*、5R*、7R* 构型。