Convenient Syntheses of Unsymmetrical Imidazolidines
作者:Alan R. Katritzky、Kazuyuki Suzuki、Hai-Ying He
DOI:10.1021/jo010868n
日期:2002.5.1
Unsymmetrical imidazolidines 10-14, optically active imidazolidines 20-22, and 2,3-dihydro-1H-benzimidazoles 28 and 29 were synthesized in good to excellent yields by Mannich reactions of 1,2-ethanediamines 8a-c, 18a-c, or N-methyl-1,2-benzenediamine (26a) with benzotriazole and formaldehyde, followed by the nucleophilic substitution of the benzotriazolyl group with C-nucleophiles (Grignard reagents