PubMed · 4336932
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S Urakabe, D Shirai. 1971. [Antidiuretic hormone (ADH)].. https://pubmed.ncbi.nlm.nih.gov/4336932/
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A series of biphenylaminocyclopropane carboxamide based bradykinin B1 receptor antagonists has been developed that possesses good pharmacokinetic properties and is CNS penetrant. Discovery that the replacement of the trifluoropropionamide in the lead structure with polyhaloacetamides, particularly a trifluoroacetamide, significantly reduced P-glycoprotein mediated efflux for the series proved essential. One of these novel bradykinin B1 antagonists (13b) also exhibited suitable pharmacokinetic properties and efficient ex vivo receptor occupancy for further development as a novel approach for the treatment of pain and inflammation.
A spontaneous dynamic kinetic resolution of 8-amino-5,6,7,8-tetrahydroquinoline 1 was observed in the presence of Candida antarctica Lipase B, in which a >60% yield of (R)-acetamide [(R)-2] was isolated from the racemic amine. The spontaneous formation of ketone 3, followed by a condensation/hydrolysis sequence with the remaining (S)-amine 1, via enamine 4, provides the necessary racemization pathway.
An asymmetric synthesis of the marine metabolite bistramide A is reported. The synthesis relies on the utility of three different organosilane reagents to construct all principle fragments and 8 of the 11 stereogenic centers of the natural product. [structure: see text].