Synthesis and resolution of 2-arylalkyl-2-(tetrazol-5-yl)-<i>N</i>-arylalkyl-carboxamides. A new class of chiral sterically hindered tetrazole derivatives
作者:Robert M. Moriarty、Stuart G. Levy
DOI:10.1002/jhet.5570320125
日期:1995.1
Chiral, racemic 2-arylalkyl-2-(tetrazol-5-yl)-N-arylalkylcarboxamides 3 were conveniently prepared from ethyl cyanoacetate in four steps. The synthetic methodology developed is a facile way of introducing bulky substituents into a peptide-like framework, affording intermediate α-arylalkyl-α-amidonitriles. These nitriles were sufficiently activated to give, upon treatment with ammonium azide in dimethylformamide
手性的,外消旋的2-芳基-2-(四唑-5-基) - ñ -arylalkylcarboxamides 3被方便地从氰基乙酸乙酯制备四个步骤。开发的合成方法是将庞大的取代基引入肽样骨架中的简便方法,从而提供中间体α-芳基烷基-α-α腈。这些腈被充分活化以在145℃下用叠氮化铵的二甲基甲酰胺溶液处理二十四至三十小时,得到相应的四唑,收率良好。已经确定,在上述条件下,光学纯的α-芳基烷基-α-oni腈被差向异构体生成非对映体产物。(S)-(-)-α-甲基苄基胺盐4的分步结晶过程还开发了四唑类以得到光学富集的四唑5。