Figure 2: Versatile transformations.

(a,b) Reduction and hydrolysis reaction. (c) Cyclization reaction. (d) Reduction to a difluoro-containing pyrrolizidine. KHMDS, Potassium bis(trimethylsilyl)amide; PIFA, [Bis(trifluoroacetoxy)iodo]benzene.
(a,b) Reduction and hydrolysis reaction. (c) Cyclization reaction. (d) Reduction to a difluoro-containing pyrrolizidine. KHMDS, Potassium bis(trimethylsilyl)amide; PIFA, [Bis(trifluoroacetoxy)iodo]benzene.