Heteroaryl-N-difluoromethyltrimethylsilanes - Versatile Sources of Heteroaryl-N-difluoromethyl Anions in Reactions with Carbonyl Compounds - Bissky, German; Staninets, Vasilij I; Kolomeitsev, Alexander A; Röschenthaler, Gerd-Volker (Synlett, 2001)