Dl. Varie et al., Synthesis and biological evaluation of cryptophycin analogs with substitution at C-6 (fragment C region), BIOORG MED, 9(3), 1999, pp. 369-374
Analogs of the antitumor agents cryptophycins 1 and 8 with dialkyl substitu
tion at C-6 (fragment C) were synthesized and evaluated for in vitro cytoto
xicity against human leukemia cells (CCRF-CEM). The activity of these analo
gs decreased as the size of the substituents at C-6 increased. The C-6 spir
ocylopropyl compound (2g) was highly potent in vitro and showed excellent a
ntitumor activity in animal models. (C) 1999 Elsevier Science Ltd. ALI righ
ts reserved.