Ready access to stereodefined β-hydroxy-γ-amino acids. Enantioselective synthesis of fully protected cyclohexylstatine
作者:Patricia Castejón、Albert Moyano、Miquel A. Pericàs、Antoni Riera
DOI:10.1016/0040-4020(96)00328-6
日期:1996.5
nitrogen, a stereodivergent sequence leads to both anti and synN-Boc-aminoalkyl epoxides. Subsequent regioselective ring-opening with cyanide, protection of the resulting secondary alcohol and nitrile to carboxyl conversion afford, in good yields, protected β-hydroxy-γ-amino acids belonging to either the anti (erythro) or syn (threo) series. This methodology has been applied to the enantioselective preparation
描述了对映体纯的顺式或抗β-羟基-γ-氨基酸的方便输入。通过烯丙基醇的催化不对称环氧化和钛促进的环氧乙烷开口,可以容易地以高对映体纯度获得合成的起始化合物抗3-氨基-1,2-二醇。之后的氮,一个stereodivergent序列导致双方的充分保护防和SYN ñ -Boc -氨基环氧化物。随后用氰化物进行区域选择性开环,保护所得的仲醇和腈至羧基的转化,以良好的收率提供了属于反(赤型)或反式的保护的β-羟基-γ-氨基酸。syn(threo)系列。该方法已以完全保护的形式用于对映体选择性制备环己基他汀的对映体,环己基他汀是几种天冬氨酰蛋白酶抑制剂的关键成分。