Asymmetric cycloaddition of 1-phenoxycarbonyl- (1) or 1-methoxycarbonyl-1,2-dihydropyridine (2) with N-acryloyl-(IS)-2,10-camphorsultam (3) produced chiral isoquinuclidine 4a or 5a ill good yields with excellent diastereoselectivity ill the presence of a Lewis acid Such as titanium tetrachloride, zirconium tetrachloride, or hafnium tetrachloride. The absolute stereochemistry assignment of endo-cycloaddition products 4a and 5a has been established to be IS. 4R, and 7S.