Cwg. Fishwick et al., CYCLIC-FUSED AZOMETHINE-YLIDES, IMIDATE-METHYLIDES, AND THIOIMIDATE-METHYLIDES - AN EFFICIENT REGIOCONTROLLED ENTRY INTO SPIRO-FUSED PYRROLIDINES, Tetrahedron letters, 37(29), 1996, pp. 5163-5166
Generation of azomethine ylides, imidate methylides, and thioimidate m
ethylides which are exocyclic to indane, benzofuran, benzothiophene, a
nd benzopyran moieties respectively, in the presence of electron defic
ient dipolarophiles, gives direct access to spiro-fused pyrrolidines i
n good yields and excellent regioselectivity. Copyright (C) 1996 Elsev
ier Science Ltd