PubMed · 13762270
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C G LINDBLAD. 1960-11-10. [Something on glutarimides].. https://pubmed.ncbi.nlm.nih.gov/13762270/
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Linear unselective CCR3 antagonist leads with IC(50) values in the 200 nM range were converted into low nM binding compounds selective at CCR3 by moving the piperidine nitrogen substituent to the carbon at the 2-position of the ring. Substitution of the piperidine nitrogen with simple alkyl and acyl groups was found to improve the selectivity of this new compound class. In particular, N-{3-[(2S, 4R)-1-(propyl)-4-(4-fluorobenzyl)piperidinyl]propyl}-N'-(3-acetylphenyl)urea exhibited single digit nanomolar IC(50) values for CCR3 with >100-fold selectivity against an extensive counter screen panel.
[reaction: see text] The intramolecular Mannich reaction of delta-amino beta-keto esters with aldehydes and ketones is a new methodology for the synthesis of polysubstituted piperidines and is illustrated by the concise asymmetric synthesis of the dendrobate alkaloid (+)-241D and its C-4 epimer.
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