Preparation of N-alkyl-N′-carboalkoxy guanidines: unexpected effective trans-alkoxylation transforming the 2,2,2-trichloroethoxycarbonyl into various carbamates
作者:Cosima Schroif-Grégoire、Karine Barale、Anne Zaparucha、Ali Al-Mourabit
DOI:10.1016/j.tetlet.2007.01.126
日期:2007.3
range of N-alkyl-N′-Boc guanidines was simply synthezized from monoprotected Boc-1H-pyrazole-1-carboxamidine by reaction with primary amines. Synthesis of the hindered (R)-N-methylbenzyl-N′-Troc guanidine was achieved from the corresponding thiourea by the action of ammonia. Transformation of the Troc group into others carbamate groups, including Boc, was simply obtained by refluxing in the appropriate
的范围ñ -烷基- ñ '-Boc胍被简单地从单保护的Boc-1 synthezized ħ -吡唑-1-甲脒通过与伯胺反应。由相应的硫脲通过氨的作用实现了受阻的(R)-N-甲基苄基-N′-Troc胍的合成。Troc基团向包括Boc在内的其他氨基甲酸酯基团的转化只需在适当的醇中回流即可获得。