D. Miguel et al., SYNTHETIC STUDIES ON INDOLE ALKALOIDS .8. SYNTHESIS AND REACTIVITY OFASYMMETRIC 2-INDOLYL-4-METHYLENEPIPERIDINES, Tetrahedron, 51(27), 1995, pp. 7527-7546
The synthesis of asymmetric 2-indolyl-4-methylenepiperidines 8-11 and
14-15 by condensation of an aminoallylsilane with an indole carbaldehy
de, followed by intramolecular cyclization of the intermediate, is des
cribed. The reactivity of N-(2-hydroxyethyl)indolylpiperidines 9 and 1
4 with K(t)BuO to give indolo[2,3-a]quinolizidines is studied. Some un
expected results are obtained due to the influence of the alpha-phenyl
ring.