H. Katayama et al., HETEROCYCLIC-ANALOGS OF QUINONE METHIDE - PREPARATION AND CYTOTOXICITY OF 3-OXO-3H-PYRAZOLO[1,5-A]INDOLE DERIVATIVES, Chemical and Pharmaceutical Bulletin, 45(1), 1997, pp. 143-147
A series of 3-oxo-3H-pyrazolo[1,5-a]indole derivatives was prepared an
d characterized as heterocyclic analogues of quinone methide, These co
mpounds showed some cytotoxicity to cancer cells, but were ineffective
in an in vivo test against murine leukemia L1210.