Improved Preparation of Racemic 2-Amino-3-(heteroaryl)propanoic Acids and Related Compounds Containing a Furan or Thiophene Nucleus
作者:Tokujiro Kitagawa、Dashrenchin Khandmaa、Ayumi Fukumoto、Makoto Asada
DOI:10.1248/cpb.52.1137
日期:——
noic acids (1), mostly with a furan or thiophene nucleus as a heteroaryl group, were synthesized in 48-94% yield by the reduction of 3-(heteroaryl)-2-(hydroxyimino)propanoic acids (5) with zinc dust and formic acid in the presence of a catalytic amount of iron dust at 60 degrees C for 2 h. Under these conditions, unfavorable hydrogenolysis of bromine on the thiophene nucleus does not occur. Traditional
外消旋的2-氨基-3-(杂芳基)丙酸(1),主要具有呋喃或噻吩核作为杂芳基,通过还原3-(杂芳基)-2-(羟基亚氨基)以48-94%的产率合成丙酸(5)与锌粉和甲酸,在催化量的铁粉存在下于60摄氏度下反应2小时。在这些条件下,不会发生噻吩核上溴的不利氢解。用甲酸和乙酸酐的混合物对制备的3-(杂芳基)丙氨酸(1)进行传统的N-甲酰化,以51-95%的收率得到2-(甲酰氨基)-3-(杂芳基)丙酸(6)。