Synthesis of Hexasubstituted Carbamimidic Acid Anhydrides and of<i>N</i>
<sup>1</sup>,<i>N</i>
<sup>1</sup>,<i>N</i>
<sup>2</sup>-Trisubstituted Formamidines from 1,1,3-Trisubstituted Ureas
作者:Motoki Torizuka、Yasuo Kikugawa、Hiromu Nagashima
DOI:10.1055/s-1986-31626
日期:——
1,1,3-Trisubstituted ureas 1 were converted with phosphoryl chloride to hexasubstituted carbamimidic acid anhydrides 2 which were hitherto unknown or difficult to prepare by other methods. The ureas bearing bulky substituents were converted to amidinoyl chlorides 3 which were reduced to the corresponding formamidines 5 with amine-boranes in acid.
1,1,3-三取代脲类 1 通过磷酰氯转化为六取代氨基甲酰亚胺酸酐 2,这些酸酐迄今为止尚不为人所知或难以用其他方法制备。 带有笨重取代基的脲被转化为脒酰氯 3,然后在酸中用氨基硼还原成相应的甲脒 5。