T. Takahashi et al., Novel method for the stereoselective formation of trans bicyclic ketones by way of oxidative radical cyclization, SYNLETT, (5), 1999, pp. 644-646
The stereoselective formation of cyanohydrin 4 was achieved by radical cycl
ization-oxygen trapping reaction of 5 into an intramolecular acrylic nitril
e moiety. The cyanohydrin was used for ring closure reaction with a tosylat
e, providing the bicyclic systems 1 and 2 with a trans ring fusion.