作者:Jingjun Yin、Mark A. Huffman、Karen M. Conrad、Joseph D. Armstrong
DOI:10.1021/jo052121t
日期:2006.1.1
practical synthesis of ephedrine analogues in high yields and enantiopurity was realized by a highly diastereoselective Meerwein−Ponndorf−Verley (MPV) reduction of protected α-amino aromatic ketones using catalytic aluminum isopropoxide. The high anti selectivity resulted from the chelation of the nitrogen anion to the aluminum. In contrast, high syn selectivity was obtained with α-alkoxy ketones and other
麻黄碱类似物的高收率和对映体纯度非常实用的合成,是通过使用催化异丙醇铝对非对映选择性的Meerwein-Ponndorf-Verley(MPV)还原保护的α-氨基芳族酮实现的。高抗选择性是由于氮阴离子与铝的螯合所致。相比之下,通过Felkin-Ahn对照品,可通过α-烷氧基酮和其他化合物获得高顺式选择性。