Processes for the synthesis of substituted urea compounds
US11078163B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2019 |
| Grant date | Aug 3, 2021 |
| Priority date | — |
| Expiry date | Jul 16, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention concerns a process for preparing a compound having the Formula A; or a pharmaceutically acceptable salt or derivative thereof, or for preparing a substituted urea compound of Formula IIa, or a pharmaceutically acceptable salt or ester thereof, the process comprising the reaction of an imidazolyl intermediate of Formula IIa′ with a carbamoyl halide of the formula: R1R2NC(═O)Hal, wherein Hal represents Cl, F, I or Br, wherein the intermediate of Formula IIa′ is prepared by oxidation of the derivative of R5 and R6, R6-C(═O)CH2R5 to form a glyoxal intermediate R6-C(═O)(C═O)R5, which is subjected to treatment with ammonium hydroxide and an aldehyde R8CHO to provide the intermediate of Formula IIa′ and wherein the compound substituents are as defined herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.