Linked Life Data

2738883

Source:http://linkedlifedata.com/resource/pubmed/id/2738883

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
1989-8-4
pubmed:abstractText
The activation mechanisms of the N-substituted 4-hydroxycyclophosphamide analogues 4-hydroxyifosfamide (2b), 4-hydroxytrofosfamide (2c), and 3-methyl-4-hydroxycyclophosphamide (2d) were compared with that of the unsubstituted parent compound 2a. The reaction kinetics of cis-2b, -2c, and -2d are qualitatively similar to those of 2a in that they undergo ring opening to the respective aldophosphamide intermediates 3, 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 ring opening of 2a and 2d, the N-(chloroethyl)-substituted analogues 2b and 2c undergo specific base-catalyzed ring opening. This mechanistic difference was also illustrated by the rapid reaction of 2a and 2d with sodium 2-mercaptoethanesulfonate (Mesna) under acidic conditions to give the 4-(alkylthio)-substituted cyclophosphamide derivatives 5a and 5d. Compounds 2b and 2c did not react with Mesna to generate 5b and 5c under these conditions. Both the fraction of aldehyde/hydrate present at equilibrium and the cytotoxicity against L1210 cells in vitro decreased in the order 2c greater than 2b greater than 2a greater than 2d. The plasma-catalyzed acceleration of phosphoramide mustard generation previously reported for 2a was also observed for these analogues.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0022-2623
pubmed:author
pubmed:issnType
Print
pubmed:volume
32
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1491-6
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Effects of N-substitution on the activation mechanisms of 4-hydroxycyclophosphamide analogues.
pubmed:affiliation
Department of Pharmacology, University of Rochester, New York 14642.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.