Trifluoroethyl alpha-insertion of acetals has been developed. Aromatic, heteroaromatic, and alkenyl acetals react with in situ generated (trifluoromethyl) diazomethane in the presence of antimony(V) chloride to furnish alpha-trifluoromethyl acetals. A stereoselective version of this transformation exploiting the acetal as a chiral auxiliary is also presented.
Optical rotatory dispersion studies. CXVII. Absolute configurational assignments of some .alpha.-substituted phenylacetic acids by circular dichroism measurements
作者:Guenter Barth、Wolfgang Voelter、Harry S. Mosher、Edward Bunnenberg、Carl Djerassi