2:1] and [2:2] Cycloadducts from N-Sulfonylamines and Azomethines. -The cycloaddition of N-sulfonylamine (I) with azomethine (II) gives 2:1 cycloadduct (III). 3,4-Dihydroisoquinoline (V) reacts under similar conditions via a highly unusual cycloaddition pathway furnishing the 2:2 cycloadduct (VI). -(LENDER, A.; WALKER, N. P. C.; SCHAUMANN*, E.; Tetrahedron Lett. 56 (2015) 33, 4800-4803, http://dx.