Table 2. Formation of 8-formylindolizines ^a .

^a[1] = 0.15 M.

^bIPr = 1,3-bis(diisopropylphenyl)imidazole-2-ylidene.

^cProduct yields are reported after separation from a silica column.

^dThese data correspond to 3 equiv. of isoxazole, Tf = trifluoromethanesulfonyl.