The critical distance for the cycloaromatization reactions of enediynes.

Abstract:

:It has been shown that the enediyne anticancer antibiotics e.g., calicheamicin, neocarzinostatin and others cleave DNA via the putative intermediate 1,4-diradical formed in the Bergmann cyclization and are thus useful for cancer chemotherapy. The pharmacological activity of these drugs is based, in general, on the activation of the pharmacophore and the subsequent cyclization leading to the formation of a radical, the rate of which is, in part, based on the terminal distance of the 1,5-diyne functionality, also known as the critical distance. But the critical distance alone cannot govern the rate of cyclization of the enediynes. A theoretical model has been developed to predict the rate of cyclization, and the thus the pharmacological activity, of these antibiotics based on the critical distance and the energy of activation.

journal_name

Curr Top Med Chem

authors

Capitani JF,Gaffney SM,Castaldo L,Mitra A

doi

10.2174/156802608783955719

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

470-86

issue

6

eissn

1568-0266

issn

1873-4294

journal_volume

8

pub_type

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