The ketone shown was prepared in a three-step sequence from ethyl trifluoroacetate. The first step in the

Question:

The ketone shown was prepared in a three-step sequence from ethyl trifluoroacetate. The first step in the sequence involved treating ethyl trifluoroacetate with ammonia to give a compound A. Compound A was in turn converted to the desired ketone by way of a compound B. Fill in the missing reagents in the sequence shown, and give the structures of compounds A and B.