DNA Cleavage Potency, Cytotoxicity, and Mechanism of Action of a Novel Class of Enediyne Prodrugs
摘要:
We have discovered a novel class of (E)-3-acyloxy-4-(arylmethylidene)cyclodeca-1,5-diynes which exhibit promising enediyne-like DNA cleavage and cytotoxic activities. LC-MS analysis of the incubation mixture (pH 8.5, 37 degreesC) confirmed formation of 10-membered ring enediyne presumably via an allylic cation and suggested that the 1,4-benzenoid diradical might be one of the active species for DNA damage and cytotoxicity.
First synthesis of a highly strained cyclodeca-1,5-diyne skeleton via intramolecular Sonogashira cross-coupling
摘要:
Cyclization of alkenyl bromides 6 and 11 containing a terminal alkyne was achieved by using an intramolecular cross-coupling reaction catalyzed by Pd(0) and Cu(I). Under the optimal reaction conditions, cyclodeca-1,5-diyne derivatives 7 and 12 were obtained in 43 and 28% yields, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.