吡唑并[3,4- b ]吡啶。1-保护的-1 H-吡唑并[3,4- b ]吡啶的制备并试图除去1-取代基。1-苄基-1 H-吡唑并[3,4- b ]吡啶及其7-氧化物的一些反应
摘要:
1-保护的-1 H-吡唑并[3,4- b ]吡啶[例如。(4)]和-1 H-吡唑并[3,4- b ]吡啶-6(7 H)-一[例如。(14)]是从1-取代的5-氨基吡唑类[例如。(1)],并且已经研究了保护基的去除。在酸性条件下用乙酰乙酸乙酯将1-取代的5-氨基吡唑或在相同条件下用β3-氨基丙酸衍生物(19)环合,仅得到1 H-吡唑并[3,4- b ]吡啶-6(7 H)。) -酮异构体[例如。(14)和(20)]。ñ对1-苄基-1 H-吡唑并[3,4- b ]吡啶进行氧化(4),得到7-氧化物(21),得到(20)和较不常见的β-取代产物(22)与乙酸酐。(4)或(21)的硝化仅在1-苄基取代基的对位给出取代,但是溴化或氯化在杂环的3-位给出取代。
BENZYL-1H-PYRAZOLO[3,4-B]PYRIDINES AND USE THEREOF
申请人:BAYER PHARMA AKTIENGESELLSCHAFT
公开号:US20160145271A1
公开(公告)日:2016-05-26
The present application relates to novel benzyl-1H-pyrazolo[3,4-b]pyridines, to processes for their preparation, to their use alone or in combinations for the treatment and/or prophylaxis of diseases, and to their use for producing medicaments for the treatment and/or prophylaxis of diseases, in particular for the treatment and/or prophylaxis of cardiovascular disorders.
“On Water” Palladium Catalyzed Direct Arylation of 1H-Indazole and 1H-7-Azaindazole
作者:Khadija Gambouz、Abdelmoula El Abbouchi、Sarah Nassiri、Franck Suzenet、Mostapha Bousmina、Mohamed Akssira、Gérald Guillaumet、Saïd El Kazzouli
DOI:10.3390/molecules25122820
日期:——
The C3 direct arylation of 1H-indazole and 1H-7-azaindazole has been a significant challenge due to the lack of the reactivity at this position. In this paper, we describe a mild and an efficient synthesis of new series of C3-aryled 1H-indazoles and C3-aryled 1H-7-azaindazoles via a C3 direct arylation using water as solvent. On water, PPh3 was effective as a ligand along with a lower charge of the