Cobalt-Catalyzed Preparation of N-Heterocyclic Organozinc Reagents from the Corresponding Heteroaryl Chlorides
作者:Paul Knochel、Alexander Kremsmair、Simon Graßl、Christoph J. B. Seifert、Edouard Godineau
DOI:10.1055/a-1534-0624
日期:2021.11
Various substituted and unsubstituted N-heteroaryl chlorides have been converted into their corresponding organozinc species using zinc dust in the presence of zinc pivalate and 10% CoCl2 in benzonitrile at 25 °C. The resulting heteroarylzinc reagents were obtained in 43–98% yield within 9–48 h and reacted with a broad range of electrophiles, leading to the functionalized heteroarenes.
Mono‐ or bidentate boron Lewisacids trigger a regioselective magnesiation or zincation of pyridazine in position C3 (ortho product) or C4 (meta product). The regioselectivity of the metalation was rationalized with the help of calculated pKa values of both pyridazine and pyridazine/Lewisacid complexes.
单或二齿硼路易斯酸在位置C3(邻位产物)或C4(间位产物)处引发哒嗪的区域选择性镁化或锌化。借助于计算的哒嗪和哒嗪/路易斯酸络合物的p K a值,使金属化的区域选择性合理化。
[EN] PYRROLIDINE DERIVATIVES<br/>[FR] DÉRIVÉS DE PYRROLIDINE
申请人:HUA MEDICINE (SHANGHAI) LTD
公开号:WO2017071536A1
公开(公告)日:2017-05-04
Provided herein are compounds of the formula (I), as well as pharmaceutically acceptable salts thereof, wherein the substituents are as those disclosed in the specification. These compounds, and the pharmaceutical compositions containing them, are useful for the treatment or prevention of mGluR5 mediated disorders, such as acute and/or chronic neurological disorders, cognitive disorders and memory deficits, as well as acute and chronic pain.
This communication describes the deproto-metalation of a large range of aromatics including heterocycles using a newly developed lithium–cadmium base; the reaction proceeds at room temperature with an excellent chemoselectivity and efficiency, and proved to be regioselective in most cases.
Synthesis of substituted diazino[c]quinolin-5(6H)-ones, diazino[c]isoquinolin-6(5H)-ones, diazino[c]naphthyridin-6(5H)-ones and diazino[c]naphthyridin-5(6H)-ones
Substituted diazino[c]quinolin-5(6H)-ones and -isoquinolin-6(5H)-ones, diazino[c]naphthyridin-6(5H)- and -5(6H)-ones were obtained using two synthetic routes: one-pot cross-coupling/cyclisation and two-step cross-coupling/KOH-mediated anionic ring closure. The two strategies gave yields in the same order of magnitude and their choice depends on the availability of the starting material.
使用以下方法获得取代的重氮[ c ]喹啉-5(6 H)-one和-异喹啉-6(5 H)-one,重氮[ c ]萘啶-6(5 H)-和-5(6 H)-one。两种合成途径:一锅交叉偶联/环化和两步交叉偶联/ KOH介导的阴离子闭环。两种策略产生的收率处于相同的数量级,其选择取决于起始物料的可用性。