C. Chapuis et al., COMPLETE PI-FACIAL STEREOSELECTIVITY IN THE TICL4-MEDIATED [4-FUMAROYLDI[(2R)-BORNANE-10,2-SULTAM](2] CYCLOADDITION OF CYCLOPENTADIENE TO N,N'), Helvetica Chimica Acta, 78(1), 1995, pp. 145-150
Under the co-operative influence of two prosthetic groups, and indepen
dent of the TiCl4 concentration, complete and constant diastereofacial
pi-selection was achieved during the [4 + 2] cycloaddition of cyclope
ntadiene to N,N'-fumaroyl-di[(2R)-bornane-10,2-sultam] ((-)-1c); react
ive conformations are discussed.