Effects of N-substitution on the activation mechanisms of 4-hydroxycyclophosphamide analogs
作者:Chul Hoon Kwon、Richard F. Borch
DOI:10.1021/jm00127a016
日期:1989.7
which can reclose to the cis- or trans-4-hydroxy isomers or undergo base-catalyzed beta-elimination to generate the corresponding phosphoramide mustard products 4. In contrast to the general acid catalysis observed for ringopening of 2a and 2d, the N-(chloroethyl)-substituted analogues 2b and 2c undergo specific base-catalyzedringopening. This mechanistic difference was also illustrated by the rapid
Racemic mixtures and laevorotatory enantiomers of cis- and trans-4-hydroperoxyifosfamide and 4-hydroperoxybromofosfamide possess high antitumour activity both in vitro and in vivo. However, no major differences in biological activity were observed among these stereoisomers. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
Synthesis, stereochemistry and antitumor activity of 4-hydroperoxyisophosphamide (NSC-227114) and related compounds.
4-Hydroperoxyisophosphamide and its analogues were simply synthesized by ozonolysis reactions of O-(3-butenyl)-N, N'-bis (2-chloroethyl) phosphorodiamidate and related O-(3-butenyl) phosphoramidates. An acid-catalyzed isomerization of 4-hydroperoxyisophosphamide proceeded with inversion of its phosphorus configuration giving 2-epi-4-hydroperoxyisophosphamide. Both isomers readily afforded C4-substituted isophosphamide derivatives by reactions with nucleophilic agents and acid. L1210 antileukemic activities were tested for the isomers and some analogues revealing that the C4-hydroperoxylation of isophosphamide resulted in a marked enhancement of its activity and that the inverted stereochemistry of an alkylating functionality at the phosphorus atom is also effective in promoting the antitumor action as an alternative activated species of isophosphamide.