<i>α</i>-(Trifluoromethyl)amine Derivatives via Nucleophilic Trifluoromethylation of Nitrones
作者:Derek W. Nelson、James Owens、Diana Hiraldo
DOI:10.1021/jo000685l
日期:2001.4.1
(Trifluoromethyl)trimethylsilane (TMSCF(3)) reacts with nitrones to afford alpha-(trifluoromethyl)hydroxylamines protected as O-trimethylsilyl ethers. Potassium t-butoxide initiates the nucleophilic trifluoromethylation. The reaction works best with alpha,N-diaryl nitrones, and the conditions are compatible with a range of substituents on the aryl groups. Acidic deprotection of the nitrone/TMSCF(3)
(三氟甲基)三甲基硅烷(TMSCF(3))与硝酮反应,得到保护为O-三甲基甲硅烷基醚的α-(三氟甲基)羟胺。叔丁醇钾引发亲核三氟甲基化。该反应与α,N-二芳基硝酮最有效,并且条件与芳基上的一系列取代基相容。硝酸/ TMSCF(3)加合物的酸性脱保护生成α-(三氟甲基)羟胺。加合物的催化氢化产生α-(三氟甲基)胺。在α-芳基环或杂环α-芳基上具有强吸电子基团的Nitrone / TMSCF(3)加合物经历消除/加成序列以生成α,α-双(三氟甲基)胺。烷基直接与1,3-偶极部分结合的亚硝基无法与TMSCF(3)反应,