(E)-and (Z)-3-(4-chloro-5H-dithiazol-5-ylidene)-1,1,1-trifluoropentane-2,4-diones and their analogs: stereochemistry and their mechanisms of formation
作者:Hyi-Seung Lee、Kyongtae Kim
DOI:10.1016/s0040-4039(98)01174-5
日期:1998.8
The reactions of Appel's salt with active methylene compounds such as 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, 1,1,1-trifluoro-2,4-pentanedione, ethyl 4,4,4-trifluoro-3-oxobutanoate, 4,4,4-trifluoro-1-phenyl-1,3-butanedione, and 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione in the presence of pyridine in CH2Cl2 at room temperature afforded the corresponding 5-alkyliden-1,2,3-dithiazoles. The ratios
Appel盐与活性亚甲基化合物(例如1,1,1,5,5,5-六氟-2,4-戊二酮,1,1,1-三氟-2,4-戊二酮,乙基4,4, 4-三氟-3-氧代丁酸酯,4,4,4-三氟-1-苯基-1,3-丁二酮和4,4,4-三氟-1-(2-萘基)-1,3-丁二酮在室温下在CH 2 Cl 2中存在吡啶,得到相应的5-亚烷基-1,2,3-二噻唑。每种立体异构体的比例通过19 F NMR光谱法确定。