Fig. 3: Substrate scope of the photo-promoted ring contraction of pyridines.
From: Pyrrolidine synthesis via ring contraction of pyridines

Wide generality of pyridine substrates and excellent compatibility with various functional groups are demonstrated, enabling facile access to pyrrolidine derivatives bearing a 2-azabicyclo[3.1.0]hex-3-ene skeleton from easily available pyridines. TBS tert-butyldimethylsilyl, Ac acetyl, Boc tert-butoxycarbonyl, TMS trimethylsilyl.