Synthesis and Aldol Stereoselectivity of 2-Oxazolidinones Derived from L-Histidine
作者:Francisco Bermejo Gonzalez、Julia Perez Baz、Fabio Santinelli、Fernando Mayor Real
DOI:10.1246/bcsj.64.674
日期:1991.2
The regiospecific synthesis of the 2-oxazolidinones 5b, 7, 12a, and 12b starting from L-histidine la is described. The stereoselectivity in the dibutyl(trifluoromethylsulfonyloxy)borane promoted aldol condensation between the chiral imides 13a and 13b and benzaldehyde was also studied. The formation of a cationic imidazole–boron complex, 14a, occurs before the aldol condensation between 13a and benzaldehyde
描述了从 L-组氨酸 1a 开始的 2-恶唑烷酮 5b、7、12a 和 12b 的区域特异性合成。还研究了二丁基(三氟甲基磺酰氧基)硼烷中的立体选择性促进了手性酰亚胺 13a 和 13b 与苯甲醛之间的羟醛缩合。阳离子咪唑-硼络合物 14a 的形成发生在 13a 和苯甲醛之间的羟醛缩合发生之前。然而,13b 和苯甲醛之间的缩合发生时没有形成任何硼络合物。C-4 处取代基的空间位阻可能是这种行为差异的原因。