Lithiation of 2-Heterosubstituted Pyridines with BuLi−LiDMAE: Evidence for Regiospecificity at C-6
摘要:
The determination of the initial deprotonation site of 2-chloro- and 2-methoxypyridine during reaction with BuLi-LiDMAE has been investigated. A series of experiments on deuterated regioisomers revealed a direct lithiation at C-6 excluding a potential first classical ortholithiation and lithium equilibration in the reaction medium. These results suggested that the formation of lithium aggregates at the neighboring of the pyridinic nitrogen atom favored BuLi delivery at C-6 as well as 6-lithio intermediate stabilization.
N-(HETERO)ARYL-PYRROLIDINE DERIVATIVES OF PYRAZOL-4-YL-PYRROLO[2,3-d]PYRIMIDINES AND PYRROL-3-YL-PYRROLO[2,3-d]PYRIMIDINES AS JANUS KINASE INHIBITORS
申请人:Rodgers James D.
公开号:US20100298334A1
公开(公告)日:2010-11-25
The present invention relates to N-(hetero)aryl-pyrrolidine derivatives of Formula I:
which are JAK inhibitors, such as selective JAK1 inhibitors, useful in the treatment of JAK-associated diseases including, for example, inflammatory and autoimmune disorders, as well as cancer.
α-Heteroarylation of Thioethers via Photoredox and Weak Brønsted Base Catalysis
作者:Edwin Alfonzo、Sudhir M. Hande
DOI:10.1021/acs.orglett.1c02151
日期:2021.8.6
thioethers to α-thio alkyl radicals and their addition to N-methoxyheteroarenium salts for the redox-neutral synthesis of α-heteroaromatic thioethers. Studies are consistent with a two-step activation mechanism, where oxidation of thioethers to sulfide radical cations by a photoredox catalyst is followed by α-C–H deprotonation by a weak Brønsted base catalyst to afford α-thio alkyl radicals. Further,
Unusual C-6 Lithiation of 2-Chloropyridine-Mediated by BuLi−Me<sub>2</sub>N(CH<sub>2</sub>)<sub>2</sub>OLi. New Access to 6-Functional-2-chloropyridines and Chloro-bis-heterocycles
作者:Sabine Choppin、Philippe Gros、Yves Fort
DOI:10.1021/ol005538o
日期:2000.3.1
the loss of chlorine atom while exclusive directed ortho metalation is obtained using LDA. Herein it is shown that the BuLi-Me(2)N(CH(2))(2)OLi (BuLi-LiDMAE) superbase promotes an unprecedented regioselective C-6 lithiation. The method was successfully applied to the preparation of potentially useful chlorinated pyridinic and bis-heterocyclic synthons.
One-pot double functionalisation of π-deficient heterocyclic lithium reagents
作者:Anthony Chartoire、Corinne Comoy、Yves Fort
DOI:10.1039/c0ob00734j
日期:——
Herein, we report an efficient method for the double functionalisation of lithiated halogenopyridines, -pyrazines or -furopyridines through a convenient one-pot electrophilic trapping/nucleophilic substitution sequence.
Oxadiazolopyridine Derivates for Use as Ghrelin O-Acyl Transferase (GOAT) Inhibitors
申请人:Boehringer Ingelheim International GmbH
公开号:US20180037594A1
公开(公告)日:2018-02-08
The present invention relates to compounds of general formula I,
wherein the groups R
1
, R
2
and n are defined as in claim
1
, which have valuable pharmacological properties, in particular bind to ghrelin O-acyl transferase (GOAT) and modulate its activity. The compounds are suitable for treatment and prevention of diseases which can be influenced by this receptor, such as metabolic diseases, in particular obesity.