Bandyopadhyay S, Dutta S, Spilling CD, Dupureur CM, Rath NP. Synthesis and biological evaluation of a phosphonate analog of the natural acetyl cholinesterase inhibitor cyclophostin.
J Org Chem 2008;
73:8386-91. [PMID:
18821801 DOI:
10.1021/jo801453v]
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Abstract
Two diastereomers of a phosphonate analog 6 of the AChE inhibitor cyclophostin were synthesized. The substitution reaction of phosphono allylic carbonate 10a with methyl acetoacetate gave the vinyl phosphonate 9a. Attempted hydrogenation/debenzylation gave an unexpected enolether lactone. Alternatively, selective hydrogenation, demethylation, cyclization and debenzylation gave the phosphonate analog of cyclophostin as a separable mixture of diastereomers 6. The trans phosphonate isomer was more active than the cis isomer against AChE from two sources.
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