Efficient One-Pot Synthesis of Dithieno(dibenzothieno)-Fused Cycloheptanones, Tropones, and Cyclooctanones
作者:Valentine G. Nenajdenko、Ivan L. Baraznenok、Elizabeth S. Balenkova
DOI:10.1021/jo980079e
日期:1998.9.1
situ from the corresponding amides and triflic anhydride) with dithiophenes and dithienylmethanes proceed as tandem alkylation-Vilsmeier-Haack acylation to form dithieno- and dibenzothieno-fused cycloheptanones and cyclooctanones in moderate to good yields. The reactions of 2-bromo-N,N-dimethylacrylamide/triflic anhydride complex allow preparation of tropones in a simple one-pot procedure. The reaction
α,β-不饱和酰胺/三氟甲酸酐络合物(由相应的酰胺和三氟甲酸酐就地生成)与二噻吩和二噻吩基甲烷的反应以串联烷基化-Vilsmeier-Haack酰化反应的形式进行,形成二噻吩并和二苯并噻吩并并的环庚酮和环辛酮中等至良好的产量。2-溴-N,N-二甲基丙烯酰胺/三氟甲磺酸酐复合物的反应可通过简单的一锅法制备托克酮。2,2-二苯并噻吩基甲烷与二甲基丙烯酰胺/三氟甲磺酸酐配合物的反应异常进行,除了可预测的稠合环辛酮外,还提供了二甲基氨基萘。