<i>N</i>-Acyl- and<i>N</i>-Sulfonylformamidines from Cyanamides and Carbodiimides by Hydroalumination and Subsequent Treatment with Electrophiles
作者:Johannes Hellmann、Ines Rhotert、Hauke Westenberg、Roland Fröhlich、Birgit Wibbeling、Werner Uhl、Ernst-Ulrich Würthwein
DOI:10.1002/ejoc.201300208
日期:2013.6
react with dialkylaluminium hydrides R2AlH (R = tBu, iBu) to give compounds 9 in which one C=N bond of the carbodiimide is reduced to form an amidinate ligand and a second molecule of the hydride is coordinated through an Al–N and an Al–H–Al bond. Treatment of 9 with acyl chlorides yields N,N′-disubstituted N-acylformamidines 10, whereas reaction with sulfonyl chlorides gives the corresponding N-sulfonylformamidines
氰胺 1 与二(异丁基)氢化铝的加氢铝化得到中间体化合物 3,其在固态下具有二聚结构,具有四元 Al2N2 杂环和环外 N=C 双键。3 与酰氯反应生成 N',N'-二取代 N-酰基甲脒 5,而与磺酰氯反应生成相应的 N-磺酰甲脒 7。相反,碳二亚胺 8 与二烷基氢化铝反应 R2AlH (R = tBu, iBu)得到化合物 9,其中碳二亚胺的一个 C=N 键被还原形成脒配体,并且氢化物的第二个分子通过 Al-N 和 Al-H-Al 键配位。用酰氯处理 9 产生 N,N'-二取代的 N-酰基甲脒 10,而与磺酰氯反应得到相应的 N-磺酰甲脒 11。