Synthesis of Mono- and Difluoroacetyltrialkylsilanes and the Corresponding Enol Silyl Ethers
作者:Seiichiro Higashiya、Woo Jin Chung、Dong Sung Lim、Silvana C. Ngo、Kelly、Paul J. Toscano、John T. Welch
DOI:10.1021/jo049551o
日期:2004.9.1
A variety of mono- and difluoroacetylsilanes and the corresponding silyl enol ethers were prepared from trifluoroethanol and chlorotrialkylsilanes in the presence of LDA through retro-Brook rearrangement. Sterically demanding silyl groups, especially those bound to oxygen, resulted in higher yields of difluoroacetylsilanes. The yields of difluoroacetylsilanes were also dramatically affected by the
在LDA存在下,通过逆布鲁克重排,由三氟乙醇和氯代三烷基硅烷制备了各种单和二氟乙酰基硅烷和相应的甲硅烷基烯醇醚。立体上需要的甲硅烷基,尤其是那些与氧键合的甲硅烷基,导致二氟乙酰基硅烷的产率更高。反应的终止方法也极大地影响了二氟乙酰基硅烷的产率。由相应的二氟乙烯基甲硅烷基醚与亲电子卤化试剂以高收率制备二氟卤代乙酰基硅烷。由单氟乙酰基三异丙基硅烷通过与三氟乙酸甲酯的亲核酰化反应制得γ-氟化的β-二酮9a。