yields. Selective oxidation of diols 3a and 3b was performed using a TEMPO, NaClO(2), NaOCl cocktail in 96% and 93% respective yields. This two-step process effectively furnished multigram amounts of enantiopure N-Boc-beta-hydroxyvaline 1a.
通过对映体N-保护的
丝氨酸甲酯2a和2b,通过两步方案分别以对映体纯的形式合成N-叔丁氧基氧羰基-和N-苯磺酰基-β-羟基缬
氨酸1a和1b。将CH(3)MgBr添加到2a和2b中分别提供二醇3a和3b作为主要产物,收率分别为83%和81%。使用
TEMPO,NaClO(2),NaOCl混合物对二醇3a和3b进行选择性氧化,产率分别为96%和93%。此两步过程有效地提供了多克数量的对映纯N-Boc-β-羟基缬
氨酸1a。