在[Ru(cymene)Cl 2 ] 2(10%)的催化下,苯甘氨酸衍生物(1a-1f)的N-未保护的甲基酯与富含电子的内部炔烃(2a-2e)的反应,得到相应的3,4-双取代的异喹啉-1-羧酸酯3通过C H / N H氧化偶合。C H键活化步骤由羧酸盐协助,并且三氟甲磺酸N-氟-2,4,6-三甲基吡啶鎓用作末端氧化剂。该方法显示出对氨基酸的苯环上存在各种释放电子和吸引电子的官能团的显着耐受性。此外,苯甘氨酸衍生物(1a–1f的反应在相同的实验条件下,用[Ru(cymene)Cl 2 ] 2(10%)催化的丙烯酸甲酯(4a),通过C H / N H偶合得到相应的3,N-二取代的异吲哚啉-1-羧酸酯5。以非对映异构体的混合物形式获得异二氢吲哚5,具有中等至高的非对映异构体过量值(最高80%)。
Efficient access to (1H)-isoindolin-1-one-3-carboxylic acid derivatives by orthopalladation and carbonylation of methyl arylglycinate substrates
摘要:
The orthopalladation of methyl arylglycinate derivatives has been studied. The reaction proceeds efficiently for different electron-withdrawing and electron-releasing substituents at the aryl ring. The carbonylation of the orthopalladated complexes affords, in a single step, substituted (1H)-isoindolin-1-one-3-carboxylates. These compounds constitute valuable synthetic intermediates and can be transformed diastereoselectively into octahydroisoindole-1-carboxylic acid derivatives, an important scaffold in the synthesis of many biologically active compounds. (C) 2011 Elsevier Ltd. All rights reserved.
An efficient method for the synthesis of 3-hydroxymethyl isoindolinones via cobalt-catalyzed C(sp2)–H carbonylation of phenylglycinol derivatives using picolinamide as a traceless directing group is demonstrated. The reaction proceeds in the presence of a commercially available cobalt(II) tetramethylheptanedionate catalyst and employs DIAD as a “CO” surrogate. This synthetic route offers a broad substrate
[EN] NOVEL NON-SYSTEMIC TGR5 AGONISTS<br/>[FR] NOUVEAUX AGONISTES DE TGR5 NON SYSTÉMIQUES
申请人:VENENUM BIODESIGN LLC
公开号:WO2018005801A3
公开(公告)日:2018-02-01
Triple Role of Phenylselenonyl Group Enabled a One-Pot Synthesis of 1,3-Oxazinan-2-ones From α-Isocyanoacetates, Phenyl Vinyl Selenones, and Water
作者:Thomas Buyck、Qian Wang、Jieping Zhu
DOI:10.1021/ja506031h
日期:2014.8.13
Reaction of alpha-substituted alpha-isocyanoacetates with phenyl vinyl selenones in the presence of a catalytic amount of base (DBU or Et3N, 0.05-0.1 equiv) followed by addition of p-toluenesulfonic acid (PTSA, 0.1-0.2 equiv) afforded 4,4,5-trisubstituted 1,3-oxazinan-2-ones in good to excellent yields. Enantiomerically enriched heterocycles can also be prepared using a Cinchona alkaloid-derived bifunctional organocatalyst for the Michael addition step. The phenylselenonyl group served as an activator for the Michael addition, a leaving group and a latent oxidant in this integrated reaction sequence.