designed synthetic approach also lies in the use of N-allenamides as substrates, which, after the addition of the first electrophilic radical, preserve a further reactive π-system, making possible the addition of a second α-keto radical and enabling the installation of a keto functionality at a remote position. The good yields, the broad scope, and the possibility to further synthetically elaborate
A synthetic procedure, catalysed by Ir(ppy)3 under visible-light irradiation, for the chemodivergent synthesis of 2,3-dihydrofurans (3) or β,γ-unsaturated ketones (7) starting from α-halo ketones (1) and alkenes (2) has been developed. The mild reaction conditions and the redox-neutral nature of the process make it particularly sustainable avoiding the use of both sacrificial reactants and stoichiometric
Useful Access to Uncommon Thiazolo[3,2-<i>a</i>]indoles
作者:Giacomo Mari、Lucia De Crescentini、Gianfranco Favi、Amalija Golobič、Stefania Santeusanio、Fabio Mantellini
DOI:10.1021/acs.joc.3c02338
日期:2024.1.19
A practical and environmentally benign protocol for the assembly of poly substituted-thiazolo[3,2-a]indoles from 3-alkylated indoline-2-thiones and 2-halo-ketones has been developed. This metal-free approach consists in a complete chemo/regioselective formal [3 + 2] annulation that occurs in air, at 60 °C, and in water as the sole reaction medium. The opportunity to vary the substitution pattern up
已经开发了一种实用且环境无害的方案,用于从 3-烷基化吲哚啉-2-硫酮和 2-卤代酮组装聚取代噻唑并[3,2-a]吲哚。这种无金属方法包括在空气中、60 °C 和水中作为唯一反应介质的完全化学/区域选择性形式 [3 + 2] 环化。该方法的主要合成特点是有机会将取代模式改变到多达六个不同的位置、无味的硫酸化化合物操作、非常容易的产物分离以及温和的反应条件。按比例放大的实验和产物的连续转化进一步证明了这种化学的实用性。
Process for prepararing 5-methyl-4-imidazolecarboxylic acid esters
申请人:SMITHKLINE BECKMAN CORPORATION
公开号:EP0049638A1
公开(公告)日:1982-04-14
A process for the preparation of 5-methyl-4-imidazolecarboxylic acid esters from acetoacetic acid esters. The products of this process are useful as intermediates for preparing cimetidine.
一种从乙酰乙酸酯制备 5-甲基-4-咪唑羧酸酯的工艺。该工艺的产品可用作制备西咪替丁的中间体。
Original 2-(3-Alkoxy-1<i>H</i>-pyrazol-1-yl)pyrimidine Derivatives as Inhibitors of Human Dihydroorotate Dehydrogenase (DHODH)
From a research program aimed at the design of new chemical entities followed by extensive screening on various models of infectious diseases, an original series of 2-(3-alkoxy-1H-pyrazol-1-yl)pyrimidines endowed with notable antiviral properties were found. Using a whole cell measles virus replication assay, we describe here some aspects of the iterative process that, from 2-(4-benzyl-3-ethoxy-5-methyl-1H-pyrazol-1-yl)pyrimidine, led to 2-(4-(2,6-difluorophenoxy)-3-isopropoxy-5-methyl-1H-pyrazol-1-yl)-5-ethylpyrimidine and a 4000-fold improvement of antiviral activity with a subnanomolar level of inhibition. Moreover, recent precedents in the literature describing antiviral derivatives acting at the level of the de novo pyrimidine biosynthetic pathway led us to determine that the mode of action of this series is based on the inhibition of the cellular dihydroorotate dehydrogenase (DHODH), the fourth enzyme of this pathway. Biochemical studies with recombinant human DHODH led us to measure IC50 as low as 13 nM for the best example of this original series when using 2,3-dimethoxy-5-methyl-6-(3-methyl-2-butenyl)-1,4-benzoquinone (coenzyme Q(1)) as a surrogate for coenzyme Q(10), the cofactor of this enzyme.