Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 73, Issue 19, Pages 7651-7656Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo801463j
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Funding
- Amgen, Inc.
- NIH [R01 GM078240]
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An enantioselective synthesis of SNAP-7941, a potent melanin concentrating hormone receptor antagonist, was achieved by using two organocatalytic methods. The first method utilized to synthesize the enantioenriched dihydropyrimidone core was the Cinchona alkaloid-catalyzed Mannich reaction of beta-keto esters to acylimines and the second was the chiral phosphoric acid-catalyzed Biginelli reaction. Completion of the synthesis was accomplished via selective Urea formation at the N3 position of the dihydropyrimidone with the 3-(4-phenylpiperidin-1-yl)propylamine side chain fragment. The synthesis of SNAP-7921 highlights the utility of asymmetric organocatalytic methods in the construction of an important class of chiral heterocycles.
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