Conformationally constrained analogues of diacylglycerol. 13. Protein kinase C ligands based on templates derived from 2,3-dideoxy-L-erythro(threo)-hexono-1,4-lactone and 2-deoxyapiolactone.

Abstract:

:In the present investigation, the last two possible modes of generating conformationally semirigid diacylglycerol (DAG) analogues embedded into five-membered ring lactones as templates III and IV are investigated. The first two templates studied in previous investigations corresponded to 2-deoxyribonolactone (template I) and 4,4-disubstituted gamma-butyrolactone (template II), with the latter producing potent protein kinase C (PK-C) ligands with low nanomolar binding affinities. The templates reported in this work correspond to 2,3-dideoxy-L-erythro- or -threo-hexono-1,4-lactone (template III) and 2-deoxyapiolactone (template IV). Compounds constructed with the dideoxy-L-erythro- or -threo-hexono-1,4-lactone template were synthesized stereospecifically from tri-O-acetyl-L-glucal and L-galactono-1,4-lactone, respectively. Compounds constructed with the 2-deoxyapiolactone template were synthesized stereoselectively from di-O-isopropylidene-alpha-D-apiose. Inhibition of the binding of [3H]phorbol-12,13-dibutyrate to PK-C alpha showed that only the threo-isomer, 5-O-tetradecanoyl-2,3-dideoxy-L-threo-hexono-1,4-lactone (2) was a good PK-C ligand (Ki = 1 microM). The rest of the ligands had poorer affinities with Ki values between 10 and 28 microM. With these results, the order of importance of five-membered ring lactones as competent templates for the construction of semirigid DAG surrogates with effective PK-C binding affinity can be established as II > I approximately III > IV.

journal_name

J Med Chem

authors

Lee J,Lewin NE,Acs P,Blumberg PM,Marquez VE

doi

10.1021/jm960525v

subject

Has Abstract

pub_date

1996-12-06 00:00:00

pages

4912-9

issue

25

eissn

0022-2623

issn

1520-4804

pii

jm960525v

journal_volume

39

pub_type

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