Issue 11, 1999

Chemoenzymatic preparation of the novel antifolate thymidylate synthase inhibitor N-(4-{N-[(6S )-2-methyl-4-oxo-3,4,7,8-tetrahydro-6H-cyclopenta[g]quinazolin-6-yl]-N-(prop-2-ynyl)amino}benzoyl)-L-glutamic acid and its glutamyl cleavage product

Abstract

5-Aminoindane was converted in six steps to the cyclopenta[g]quinazoline ketone 13. Condensation of 13 with diethyl 4-aminobenzoyl-L-glutamate, followed by in situ reduction, produced the secondary amine 15. N-Propargylation of 15, followed by deprotection, gave the diacid 17 as a mixture of diastereoisomers. Treatment of 17 with the bacterial enzyme carboxypeptidase G2 resulted in removal of the L-glutamic acid residue from (6R)-17 to give a chromatographically separable mixture of the monoacid 18 and the antifolate 5 [(6S )-17], which was assayed as an inhibitor of thymidylate synthase (Kiapp = 3 nM). Treatment of isolated diacid 5 with carboxypeptidase G2 produced the monoacid 19 in ca. 98% enantiomeric excess. The (6S ) stereochemistry of compound 19 has been established by X-ray crystal structure determination of the amide derivative 24.

Supplementary files

Article information

Article type
Paper

J. Chem. Soc., Perkin Trans. 1, 1999, 1495-1504

Chemoenzymatic preparation of the novel antifolate thymidylate synthase inhibitor N-(4-{N-[(6S )-2-methyl-4-oxo-3,4,7,8-tetrahydro-6H-cyclopenta[g]quinazolin-6-yl]-N-(prop-2-ynyl)amino}benzoyl)-L-glutamic acid and its glutamyl cleavage product

J. H. Marriott, S. Neidle, Z. Matusiak, V. Bavetsias, A. L. Jackman, C. Melin and F. Thomas Boyle, J. Chem. Soc., Perkin Trans. 1, 1999, 1495 DOI: 10.1039/A901141B

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