Diastereoselective Synthesis and Estimation of the Conformational Flexibility of 6-Oxoperhydropyridazine-3-carboxylic Acid Derivatives
作者:Carlos Alvarez-Ibarra、Aurelio G. Csákÿ、Cristina Gómez de la Oliva
DOI:10.1021/jo0159800
日期:2002.5.1
alpha,beta-Didehydroglutamates have been diastereoselectively transformed into 6-oxoperhydropyridazine-3-carboxylic acid derivatives (OPCAs), which constitute a new class of cyclic amino acid derivatives. Acylation at N-1 renders dipeptides which show considerable conformational rigidity. Semiempirical calculations suggest that OPCAs might force peptide turns with different amplitudes depending on
α,β-Didehydroglutamate已被非对映选择性地转化为6-氧杂氢哒嗪-3-羧酸衍生物(OPCA),这构成了一类新的环状氨基酸衍生物。N-1的酰化作用使二肽显示出相当的构象刚度。半经验计算表明,OPCAs可能会根据取代模式和哒嗪酮环取代基的相对立体化学作用,迫使肽以不同的幅度旋转。