作者:M.T. Leplawy、D.S. Jones、G.W. Kenner、R.C. Sheppard
DOI:10.1016/0040-4020(60)89006-0
日期:1960.1
Union of α-methylalanyl residues in a peptide chain is severely sterically hindered. This hindrance can be overcome by employing either the mixed anhydride (I) of pivalic acid and benzyloxycarbonyl-α-methylalanine or, more generally, oxazolones (II), including 4,4-dimethyl-2-trifluoromethyloxazolone (II; R = CF3). 4,4-Dimethyloxazolone (II; R = H) has been obtained in solution and characterized by
肽链中的α-甲基丙氨酰基残基的结合受到严重的空间阻碍。可以通过使用新戊酸和苄氧羰基-α-甲基丙氨酸的混合酸酐(I)或更普遍地使用恶唑酮(II),包括4,4-二甲基-2-三氟甲基恶唑酮(II; R = CF 3)来克服这一障碍。)。在溶液中获得了4,4-二甲基恶唑酮(II; R = H),并通过红外光谱对其进行了表征;与在羰基上与环己胺的正常反应相反,它在次甲基上被α-甲基丙氨酸甲酯攻击。