A Versatile Approach to Noncoded β-Hydroxy-α-amino Esters and α-Amino Acids/Esters from Morita–Baylis–Hillman Adducts
作者:Fernando Coelho、Hamid Ullah、André Ferreira、José Bendassolli、Manoel Rodrigues、André Formiga
DOI:10.1055/s-0034-1379168
日期:——
approach to the diastereoselective synthesis of noncoded β-hydroxy-α-amino esters from Morita–Baylis–Hillman (MBH) adducts is described. The strategy is based on a one-pot sequence involving an oxidative cleavage of the double bond of silylated Morita–Baylis–Hillman adducts, followed by the reaction with hydroxylamine hydrochloride/pyridine to form oximes. The stereoselective reduction of the oximes with
摘要 描述了一种简单直接的方法,可以从森田-贝利斯-希尔曼(MBH)加合物中非对映选择性合成非编码β-羟基-α-氨基酯。该策略基于一锅法,其中涉及甲硅烷基化的森田-贝利斯-希尔曼加合物的双键的氧化裂解,然后与盐酸羟胺/吡啶反应生成肟。用MoCl 5 ·nH 2 O / NaBH 3 CN混合物对肟进行立体选择性还原,可分四个步骤产生相应的抗-β-羟基-α-氨基酯,总收率良好,非对映选择性高于95%。对合成方法的略微修改已允许外消旋合成一组非编码的α-氨基酯/酸和DOPA。 描述了一种简单直接的方法,可以从森田-贝利斯-希尔曼(MBH)加合物中非对映选择性合成非编码β-羟基-α-氨基酯。该策略基于一锅法,其中涉及甲硅烷基化的森田-贝利斯-希尔曼加合物的双键的氧化裂解,然后与盐酸羟胺/吡啶反应生成肟。用MoCl 5 ·nH 2 O / NaBH 3 CN混合物对肟进行立体选择性还原,可分四个步