Photochemistry of benzotriazole: an unprecedented tautomer-selective intermolecular [2+2] photocycloaddition.
[reaction: see text]. Irradiation of benzotriazole with a variety of maleimide derivatives leads to the stereo- and regioselective formation of aryl [2 + 2] photocycloaddition products. Further studies with 2-alkyl benzotriazole derivatives indicates that in the case of the parent benzotriazole this cycloaddition proceeds selectively via the 2H-tautomer.
Booker-Milburn
Kevin I
KI
School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK. k.booker-milburn@bristol.ac.uk
Wood
Paul M
PM
Dainty
Richard F
RF
Urquhart
Michael W
MW
White
Andrew J
AJ
Lyon
Helen J
HJ
Charmant
Jonathan P H
JP