Bradsher Cyclization (Bradsher Cycloaddition)

C. K. Bradsher, T. W. G. Solomons, J. Am. Chem.
Soc. 80, 933(1958)
C. K. Bradsher, J. A. Stone, J. Org. Chem. 33, 519(1968)
V. Bolitt et al., J. Am. Chem. Soc. 113, 6320(1991)
H. Yin et al., J. Org. Chem. 57, 644(1992)
T.E. Nicolas, R. W. Franck, J. Org .Chem. 69, 6904 (1995)
D. L. Boger, S.M. Weinreb, HteroDiels-Alder Methodology in
Organic Synthesis (Academic Pres, NY, 1987) pp 239-299