Unusual reaction of N-aroyldihydrocyclopenta-pyrazolidinol with ketenes: formation of 1,3,4-oxadiazoles
作者:Constantinos A Tsoleridis、Julia Stephanidou-Stephanatou、Petros Gounaridis、Hara Zika、Minodora Pozarentzi
DOI:10.1016/s0040-4020(03)00633-1
日期:2003.6
1-Benzoyl-5-hydroxy-pyrazoline 1 was prepared and its reactions with ketenes, prepared in situ from the corresponding acid chlorides 3a–3d and the mixed anhydride 4, were studied. In all cases the 1,3,4-oxadiazoles 5 were isolated. In the case of compounds 3c and 3d a second diastereomeric oxadiazole 6 was obtained. In the case of 3a,3b and 4, an interesting aroyl migration product 7 was isolated.