[EN] METHOD OF PREPARING SILYLATIVE-REDUCED N-HETEROCYCLIC COMPOUND USING ORGANOBORON CATALYST [FR] PROCÉDÉ DE PRÉPARATION D'UN COMPOSÉ N-HÉTÉROCYCLIQUE RÉDUIT PAR SILYLATION À L'AIDE D'UN CATALYSEUR À BASE D'ORGANOBORE
[EN] PROCESSES AND INTERMEDIATES FOR PREPARING A MACROCYCLIC PROTEASE INHIBITOR OF HCV<br/>[FR] PROCÉDÉS ET INTERMÉDIAIRES POUR LA PRÉPARATION D'UN INHIBITEUR DE PROTÉASE MACROCYCLIQUE DU VHC
申请人:JANSSEN PHARMACEUTICALS INC
公开号:WO2013041655A1
公开(公告)日:2013-03-28
Disclosed is a process for the preparation of a cinchonidine salt of formula (IV) via an aqueous solution of a racemic 4-hydroxy-1,2-cyclopentanedicarboxylic acid, which is subjected to cyclization without removing water, by the addition of a water- miscible organic solvent to the aqueous solution and, again without removing water, adding cinchonidine to the aqueous-organic solvent solution so as to obtain the cinchonidine salt of the lactone acid. The cinchonidine salt is allowd to crystallize so as to obtain the enantiomerically purified crystalline lactone acid cinchonidine salt (IV). The enantiomerically pure salt is an intermediate in the synthesis of HCV inhibitor compound of formula (I).
A novel 1,4-asymmetricinduction was developed for the synthesis of chiral dynemicin A model compound. By using this reaction, both enantiomers were synthesized from chiralalcohol prepared by lipase catalyzed resolution. The biological activities of these compounds were examined.
The asymmetricreduction of carbonyl compounds by means of the Ru-chiral diphosphine-chiral diamine catalysts is widely useful in organic synthesis where high levels of enantioselectivities have been attributed to multiple ligand chiral elements as well as essential stereochemical matching synergies within them. Described here is the design and discovery of new pincer-type Ru-catalysts that feature
Enantioselective Bioreduction of Medicinally Relevant Nitrogen-Heteroaromatic Ketones
作者:Wen-Ju Bai、Michelle A. Estrada、Jackson A. Gartman、Andrew S. Judd
DOI:10.1021/acsmedchemlett.3c00114
日期:2023.6.8
scalable tool to access a broad variety of nitrogen-heteroaryl-containing chiral alcohols. With multiple reactive sites, the structurally diverse set of chiral alcohols can be used for library compound preparation, early route-scouting activities, and synthesis of other pharmaceutical molecules, favorably accelerating medicinal chemistry campaigns.
我们在此报告了 FDA 批准的药物中最常用的含氮杂芳烃的酮的对映选择性生物还原。对这些含氮杂环的十个品种进行了系统研究。首次研究八类,七类耐受,显着扩大了植物介导还原的底物范围。通过在缓冲水介质中使用紫胡萝卜并采用简化的反应装置,这种生物催化转化在环境温度下在 48 小时内实现,为药物化学家提供了一种实用且可扩展的工具来获取各种含氮杂芳基的手性醇。凭借多个反应位点,结构多样的手性醇可用于库化合物制备、早期路线探索活动以及其他药物分子的合成,从而有利地加速药物化学活动。
Boron-Catalyzed Silylative Reduction of Quinolines: Selective sp<sup>3</sup> C–Si Bond Formation
A silylative reduction of quinolines to synthetically versatile tetrahydroquinoline molecules involving the formation of a C(sp(3)-Si bond exclusively beta to nitrogen is described. Triarylborane is a highly efficient catalyst (up to 1000 turnovers), and silanes serve as both a silyl source and a reducing reagent. The present procedure is convenient to perform even on a large scale with excellent stereoselectivity. Mechanistic studies revealed that the formation of a 1,4-addition adduct is rate-limiting while the subsequent C(sp(3-)Si bond-forming step from the 1,4-adduct is facile.