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Bioorg Med Chem Lett. 1998 Aug 18;8(16):2247-52.

Stereoselective synthesis of a novel and bifunctional endothelin antagonist, IRL 3630.

Author information

1
Takarazuka Research Institute, Novartis Pharma K.K., Japan.

Abstract

IRL 3630 (3), a single enantiomer of IRL 3461 with more potency was identified. Coupling reaction of the racemic fragment (1) with the chiral (L)-valinesulfonamide (2) under a biphasic solvent system (CH2Cl2-H2O) successfully led to the predominant formation of the desired isomer (3) with concomitant isomerization of 1. IRL 3630, N-butanesulfonyl-[N-(3,5-dimethylbenzoyl)-N-methyl-3-[4-(5-+ ++isoxazolyl) -phenyl]-(D)-alanyl]-(L)-valineamide, is a highly potent and bifunctional (ETA + ETB) antagonist [Ki(ETA) = 1.5 nM, Ki(ETB) = 1.2 nM].

PMID:
9873522
DOI:
10.1016/s0960-894x(98)00388-6
[Indexed for MEDLINE]

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