← EPO Patent Bulletin

METHOD OF SYNTHESIZING THYROID HORMONE ANALOGS AND POLYMORPHS THEREOF

Search Report EP4691557A3 Kind: A3 Mar 18, 2026

Applicants

Madrigal Pharmaceuticals, Inc., F. Hoffmann-La Roche Ltd

Inventors

HESTER, Keith D., DUGUID, Robert J., KELLY, Martha, CHASNOFF, Anna, DONG, Gang, CROW, Edwin L., TAUB, Rebecca, REYNOLDS, Charles H., CHOI, Duk Soon, SHU, Lianhe, WANG, Ping

Abstract

The disclosure describes methods of synthesis of pyridazinone compounds as thyroid hormone analogs and their prodrugs. Preferred methods according to the disclosure allow for large-scale preparation of pyridazinone compounds having high purity. In some embodiments, preferred methods according to the disclosure also allow for the preparation of pyridazinone compounds in better yield than previously used methods for preparing such compounds. Also disclosed are morphic forms of a pyridazinone compound. Further disclosed is a method for treating resistance to thyroid hormone in a subject having at least one TRP mutation.

IPC Classifications

C07D 237/16 20060101AFI20260206BHEP A61K 31/50 20060101ALI20260206BHEP A61P 3/00 20060101ALI20260206BHEP A61P 9/00 20060101ALI20260206BHEP

Designated States

AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR