The N-vinyl group as a protection group of the preparation of 3(5)-substituted pyrazoles via bromine–lithium exchange
摘要:
Treatment of 3,4,5-tribromopyrazole with 1,2-dibromoethane and triethylamine gave 3,4,5-tribromo-1-vinylpyrazole, which underwent regioselective bromine-lithium exchange at the 5-position. Subsequent addition of an electrophile gave 5-substituted 3,4-dibromo-1-vinylpyrazoles. These underwent bromine-lithium or bromine-magnesium exchange predominantly at the 4-position, with the regioselectivity between the 3- and 4-positions being influenced by the nature of the metal and the 5-substituent. The 5-substituted products were de-vinylated by mild treatment with KMnO4 affording 3-substituted pyrazoles. Alternatively, the 1-vinyl group could be used in ring-closing metathesis. Thus, 5-allylthio-1-vinylpyrazole produced 5H-pyrazolo[5,1-b] [1,3]thiazine upon treatment with Grubbs' second-generation catalyst. (c) 2006 Elsevier Ltd. All rights reserved.
[EN] N-(HETEROARYL) QUINAZOLIN-2-AMINE DERIVATIVES AS LRRK2 INHIBITORS, PHARMACEUTICAL COMPOSITIONS, AND USES THEREOF<br/>[FR] DÉRIVÉS DE N-HÉTÉROARYL INDAZOLE UTILISÉS EN TANT QU'INHIBITEURS DE LRRK2, COMPOSITIONS PHARMACEUTIQUES ET LEURS UTILISATIONS
申请人:MERCK SHARP & DOHME
公开号:WO2021080929A1
公开(公告)日:2021-04-29
The present invention is directed to substituted certain N-(heteroaryl)quinazolin-2-amine derivatives of Formula (I): and pharmaceutically acceptable salts thereof, wherein J, R3, and R4, are as defined herein, which are potent inhibitors of LRRK2 kinase and may be useful in the treatment or prevention of diseases in which the LRRK2 kinase is involved, such as Parkinson's Disease and other diseases and disorders described herein. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of diseases, such as Parkinson's disease, in which LRRK-2 kinase is involved.
[EN] 2-AMINOQUINAZOLINES AS LRRK2 INHIBITORS, PHARMACEUTICAL COMPOSITIONS, AND USES THEREOF<br/>[FR] 2-AMINOQUINAZOLINES SERVANT D'INHIBITEURS DE LRRK2, COMPOSITIONS PHARMACEUTIQUES ET LEURS UTILISATIONS
申请人:MERCK SHARP & DOHME
公开号:WO2022051337A1
公开(公告)日:2022-03-10
The present invention is directed to certain 2-aminoquinzaoline derivatives of Formula (I): and pharmaceutically acceptable salts thereof, wherein R1, R3, R4,X1, and X2 are as defined herein, which are potent inhibitors of LRRK2 kinase and may be useful in the treatment or prevention of diseases in which the LRRK2 kinase is involved, such as Parkinson's Disease and other diseases and disorders described herein. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which LRRK-2 kinase is involved.