Diethylaminosulphur trifluoride (DAST) as an effective reagent for preparation of methyl 2-arylpropanoates from 1-aryl-1,1-dimethoxypropan-2-ols
作者:Takayoshi Yamauchi、Kaneaki Hattori、Shun-ichi Ikeda、Kentaro Tamaki
DOI:10.1039/p19900001683
日期:——
ketones [ArC(OMe)2CH(OH)Me](Ar = Ph, 4-PhC6H4, 4-BuiC6H4, 4-MeOC6H4, 4-BrC6H4, 6-MeOnaphthalen-2-yl) with diethylaminosulphur trifluoride (DAST) affords smoothly the methyl 2-arylpropanoates in good yield via aryl-group migration. On the other hand, treatment of aryl 1-hydroxyethyl ketones with DAST gives the corresponding aryl 1-fluoroethyl ketones [ArCOCHFMe](Ar = Ph, 4-PhC6H4, 4-BuiC6H4) in high yield
芳1-羟乙基酮dimethylacetals的治疗[ARC(OME)2 CH(OH)Me](AR = PH,4-PHC 6 ħ 4,4-卜我Ç 6 ħ 4,4-MeOC 6 H ^ 4,4 -BrC 6 ħ 4,6- MeOnaphthalen -2-基)用二乙基三氟化硫(DAST),得到顺利2- arylpropanoates以良好的收率通过芳基-基团的迁移。在另一方面,治疗芳1-羟乙基酮与DAST的得到相应的芳基1-氟乙基酮[ArCOCHFMe](AR = PH,4-PHC 6 ħ 4,4-卜我Ç 6 ħ 4)高产。