Selective deprotection strategies to N-(α-methylbenzyl)-β-amino esters and derived β-lactams
作者:Stephen G Davies、Osamu Ichihara
DOI:10.1016/s0040-4039(98)01193-9
日期:1998.8
variety of N,N-diprotected β-amino esters, prepared by highly diastereoselective conjugate addition of chiral lithium amides, were selectively mono-deprotected under either reductive (hydrogenolysis) or oxidative (DDQ or CAN) conditions. Combined with these deprotection methods, lithium (α-methylbenzyl)(3,4-dimethoxybenzyl) amide 2 can be used as an efficient differentially protected chiral ammonia equivalent
通过手性锂酰胺的高度非对映选择性共轭加成制备的各种N,N-双保护的β-氨基酯在还原(氢解)或氧化(DDQ或CAN)条件下被选择性地单脱保护。与这些脱保护方法结合,锂(α-甲基苄基)(3,4-二甲氧基苄基)酰胺2可以用作有效的差异保护的手性氨当量,用于不对称合成β-氨基酸和β-内酰胺衍生物。