Synthesis of a Trisubstituted 1,4-Diazepin-3-one-Based Dipeptidomimetic as a Novel Molecular Scaffold
作者:Iris S. Weitz、Maria Pellegrini、Dale F. Mierke、Michael Chorev
DOI:10.1021/jo962257e
日期:1997.4.1
We describe two routes for the synthesis of a trisubstituted 1,2,5-hexahydro-3-oxo-1H-1,4-diazepine ring (DAP), a novel, conformationally constrained, seven-membered dipeptidomimetic ring system. The linear precursor for the model DAPs, targeted for conformational analysis studies, was obtained by reductive alkylation of tert-butyl alaninate or phenylalaninate by N-Boc-alpha-amino-gamma-oxo-N,N-dimethylbutyramide
我们描述了两种合成三取代的1,2,5-hexahydro-3-oxo-1H-1,4-diazepine环(DAP),一种新型的,构象受约束的七元二肽环系统的路线。通过构象分析研究的目标模型DAP的线性前体是通过N-Boc-α-氨基-γ-氧代-N,N-二甲基丁酰胺对丙氨酸叔丁酯或苯丙氨酸酯进行还原烷基化而获得的。对新形成的仲胺进行乙酰化,然后对氨基和羧基末端保护基进行酸解脱保护,然后再由二苯基磷酸叠氮酸酯介导的环形成产生封闭的模型DAP。DAP合成子的合成从N-(苄氧羰基)天门冬氨酸1-叔丁基氢开始。由β-羧基获得的醛用于还原烷基苯丙氨酸的烷基化,生成仲胺。端基的氢解脱保护得到线性前体,其通过由1-羟基-7-氮杂苯并三唑基-N,N,N′,N′-四甲基methyl六氟磷酸盐介导的内酰胺形成而环化。该路线产生可逆保护的六氢-1H-3-氧代-2(S)-苄基-5(S)-(叔丁氧羰基)-1,4-二氮杂