Synthesis of 1,2,4,5-Tetrasubstituted Imidazoles by a Sequential Aza-Wittig/Michael/Isomerization Reaction
作者:Yi-Bo Nie、Long Wang、Ming-Wu Ding
DOI:10.1021/jo201846w
日期:2012.1.6
obtained from aza-Wittig reactions of iminophosphorane 3 with aryl isocyanates, reacted with secondary amines in the presence of a catalytic amount of sodium alkoxide to give 1,2,4,5-tetrasubstituted imidazoles 7 in good yields. However, 4-acylimidazoles 11 were obtained, as phenols were used in the presence of a catalytic amount of potassium carbonate due to further air oxidation of the expected products
由亚氨基磷烷3与芳基异氰酸酯的氮杂-维蒂希反应获得的碳二亚胺4在催化量的醇钠存在下与仲胺反应,以高收率得到1,2,4,5-四取代的咪唑7。然而,由于预期产物10的进一步空气氧化,由于在催化量的碳酸钾的存在下使用苯酚,因此获得了4-酰基咪唑11。