Reaction of 2-(2,2,2-Trifluoroethylidene)-1,3-dithiane 1-Oxide with Ketones under Pummerer Conditions and Its Application to the Synthesis of 3-Trifluoromethyl-Substituted Five-Membered Heteroarenes
作者:Takayuki Kobatake、Suguru Yoshida、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1002/anie.200906774
日期:2010.3.22
Easy as pie: With the aid of triflic anhydride, the title reaction resulted in nucleophilic attack of the carbonyl oxygen atom onto the activated cationic sulfur center and subsequent [3,3]‐sigmatropic rearrangement (see scheme). The products are precursors of the difficult‐to‐synthesize five‐membered 3‐trifluoromethyl heteroarene compounds.
简单易用:借助三氟甲磺酸酐,标题反应导致羰基氧原子亲核攻击活化的阳离子硫中心,并随后发生[3,3]-σ重排(请参见方案)。该产品是难于合成的五元3-三氟甲基杂芳烃化合物的前体。