An efficient and general enantioselective synthesis of some isoxazole-containing analogues of the neuroexcitant glutamic acid
作者:Hassan Pajouhesh、Kenneth Curry
DOI:10.1016/s0957-4166(98)00275-4
日期:1998.8
amino acids are an important class of neuroexcitant which are difficult to prepare in enantiopure form. Diastereoselective alkylation of the enantiomerically pure glycine derivative, tert-butoxycarbonyl-2-(tert-butyl)-3-methyl-4-oxo-1-imidazolidinecarboxylate (Boc-BMI) with 4-bromomethyl-2-methoxymethyl-5-methylisoxazolin-5-one 5 or 5-bromomethyl-4-bromo-3-methoxyisoxazole, gives intermediates which
异恶唑氨基酸是一类重要的神经兴奋剂,很难以对映纯形式制备。对映体纯的甘氨酸衍生物叔丁氧基羰基-2-(叔丁基)-3-甲基-4-氧代-1-咪唑烷羧酸(Boc-BMI)的非对映选择性烷基化与4-溴甲基-2-甲氧基甲基-5-甲基异唑啉- 5-一5或5-溴甲基-4-溴-3-甲氧基异恶唑,提供中间体,该中间体在温和的水解条件下可产生氨基酸(S)-和(R)-溴高纯肉烯酸以及(S)-和(R)-2 ee> 99%的-氨基-3-(3-羟基-5-甲基异恶唑-4-基)丙酸。