Y. Fukui et M. Somei, Simple synthesis of 1,3,4,5a,6,10b,11,11a-octahydro-2H-pyrazi-no[1 ',2 ': 1,5]pyrrolo[2,3-b]indole derivatives based on 1-hydroxyindole chemistry, HETEROCYCLE, 55(11), 2001, pp. 2055-2057
3-Substituted (3S,6S)-6-(1-hydroxyindol-3-ylmethyl)-2,5-piperazinediones ar
e prepared for the first time. They are shown to be suitable intermediates
for the synthesis of 3, 10b-disubstituted (3S,5aR, 10bS,11aS)-1,3,4,5a,6, 1
0b, 11, 11a-octahydro-2H-pyrazino[1',2':1,5]pyrrolo[2,3-b]indole-1,4-dione
derivatives.