Me2(CH2Cl)SiCF3 Facilitated Tandem Synthesis of Oxasilacycles Featuring a Trifluoromethyl Group.

An unprecedented tandem trifluoromethylsilylation/intramolecular SN2 substitution sequence was realized by using bifunctional reagent Me2(CH2Cl)SiCF3, allowing efficient construction of valuable trifluoromethylated oxasilacyclohexanes that are difficult to access by known methods. Initial attempts into developing asymmetric variant reveal that using cinchonine-derived dimeric PTC catalyst could afford chiral oxasilacyclohexanes in up to 92% enantiomeric excess.