The Synthesis of Some Chiral 2-Aminoalkyloxazole-4-carboxylates from Isoxazol-5(2H)-ones
作者:Matthew Cox、Rolf H. Prager、Carina E. Svensson
DOI:10.1071/ch03052
日期:——
Ethyl 4-methyl-5-oxo-2,5-dihydroisoxazole-3-carboxylate can be N-acylated by a number of natural and synthetic phthalimidylamino acids in the presence of carbodiimides. The N-acylated products form the corresponding oxazoles smoothly when irradiated at 300 nm in acetone. Removal of the phthalimido protecting group then gives 2-aminoalkyloxazole-4-carboxylate esters in good overall yields, and without
在碳二亚胺存在下,4-甲基-5-氧代-2,5-二氢异恶唑-3-甲酸乙酯可以被许多天然和合成的邻苯二甲酰亚胺基氨基酸N-酰化。N-酰化产物在丙酮中以 300 nm 照射时顺利形成相应的恶唑。然后去除邻苯二甲酰亚胺保护基团以良好的总产率得到 2-氨基烷基恶唑-4-羧酸酯,并且在任何步骤中都没有显着的外消旋化。