Reaction of 1-(1-Alkoxyalkyl)-1H-1,2,4-triazole with Amides
摘要:
1-(1-Alkoxyalkyl)-1H-1,2,4-triazoles (4) were prepared by treating acetals (1) with 1H-1,2,4-triazole (2) in the presence of pyridinium p-toluenesulfonate (3). The alkoxy group of 4 was substituted with -NR4 COR3 group by treating with carboxamides to give various 1-(1-acylaminoalkyl)-1H-1,2,4-triazole (6) in variable yields.
Asymmetric induction using chiral 1,2,4-triazole and benzimidazole derivatives
作者:Alan R. Katritzky、Diana C. Aslan、Peter Leeming、Peter J. Steel
DOI:10.1016/s0957-4166(97)00155-9
日期:1997.5
Lithiated N-substituted 1,2,4-triazoles 3 and 8 and benzimidazole 11 reacted with (1R)-fenchone to give derivatives 5c, 9 and 12 in good yields as single diastereoisomers. (S)-Lactic acid 16 reacted with o-phenylenediamine 15 to give optically pure (S)-2-(I-hydroxyethyl)benzimidazole 17 (85%). Ring closures converted the fenchone derivative 12 into novel tricyclic fused benzimidazoles 13 and 14, and converted oxazolidine derivative 17 into compound 18 in yields of 50-70% as single diastereoisomers. Lithiated derivative 18 was alkylated to give compound 19 as a single diastereoisomer in high yield. (C) 1997 Elsevier Science Ltd.
OHTA, SHUNSAKU;MARUYAMA, AKIHIKO;KAWASAKI, IKUO;HATAKEYAMA, SHOKO;ICHIKAW+, HETEROCYCLES, 31,(1990) N1, C. 2029-2036