One‐Pot, Atom and Step Economy (PASE) Assembly of Trifluoromethylated Pyrimidines from CF 3 ‐Ynones

A highly efficient synthetic method for the preparation of of 6‐trifluoromethylated pyrimidines was developed. The reaction of CF 3 ‐substituted ynones and nitrogen 1,3‐bis(nucleophile)s was employed for the one‐pot assembly of the pyrimidine core. The cascade route proceeded through an aza‐Michael addition, intramolecular cyclization, and dehydration reaction sequence to give the target heterocycles in excellent yields (up to 97 %). When acetamidine was used as the bis(nucleophile), the unexpected addition of two equivalents of the CF 3 ‐substituted ynone to the acetamidine was observed.