Palladium-catalysed cross double carbonylation of amines and alcohols: synthesis of oxamates
作者:Shun-Ichi Murahashi、Yo Mitsue、Kazuo Ike
DOI:10.1039/c39870000125
日期:——
Crossdoublecarbonylation of amines and alcohols in the presence of PdCl2(MeCN)2/Cul catalyst under CO and O2 at room temperature gives oxamates efficiently.
morpholine-2-aryl-2-acetaldehyde from morpholine-2-aryl-3-one is reported. The quaternary carbon is introduced during a palladium-promoted asymmetric allylic alkylation. This is a useful intermediate in the synthesis and development of potent NK antagonist. alkylation - palladium - asymmetric catalysis - heterocycle
Palladium-Catalyzed Double and Single Carbonylations of<i>β</i>-Amino Alcohols. Selective Synthesis of Morpholine-2,3-diones and Oxazolidin-2-ones and Applications for Synthesis of<i>α</i>-Oxo Carboxylic Acids
Catalytic crossdoublecarbonylation of secondary amines and alcohols proceeds in the presence of [PdCl2(MeCN)2] and CuI under carbon monoxide (80 atm) and oxygen (5 atm). Catalytic intramolecular doublecarbonylation of β-amino alcohols gives morpholine-2,3-diones, which are excellent protecting compounds of amino alcohols and important precursors for biologically active nitrogen compounds. In contrast
仲胺和醇的催化交叉双羰基化在一氧化碳 (80 atm) 和氧气 (5 atm) 下在 [PdCl2(MeCN)2] 和 CuI 的存在下进行。β-氨基醇的催化分子内双羰基化得到吗啉-2,3-二酮,它是氨基醇的极好保护化合物和生物活性氮化合物的重要前体。相比之下,在一氧化碳和氧气 (1.0 atm) 的混合物 (1:1) 下,β-氨基醇的催化单羰基化进行选择性地得到恶唑烷-2-酮。该反应可以通过假设一种机制来解释,该机制包括(羟乙基)氨基羰基配体的羟基对氨基甲酰基钯 (II) 配合物的 CO 配体的分子内亲核攻击,然后还原消除得到吗啉-2,3-二酮。相反,羟基对氨基甲酰基的直接亲核攻击提供了恶唑烷-2-酮。作为双音和单音的常用中间体...
4-SUBSTITUENT-2-HYDROXYLMORPHOLINE-3-ONE AND PREPARATION METHOD THEREOF
申请人:Zhejiang Hisun Pharmaceutical Co., Ltd.
公开号:US20150087828A1
公开(公告)日:2015-03-26
A molecule with neural activities, especially 4-substituent-2-hydroxymorpholin-3-one, as a new intermediate of neurokinin-1 receptor antagonist aprepitant, and preparation method thereof.
The alpha,beta-C(sp(3))-H bond dual functionalization of tertiary amines is still a challenging task for both organic and medicinal chemists. Herein a direct, mild, metal-free, and site-specific method mediated by PIDA/I-2 was developed for alpha,beta-C(sp(3))-H bond dual functionalization of tertiary amines, and this method can provide facile access to alpha-keto lactams or rarely studied alpha,alpha-diiodo lactams. Moreover, this method was used for the effective syntheses of three natural products [obscurumine C (13), obscurumine O (17), and strychnocarpine (18)] and direct preparation of mimics of the in vivo metabolites of two FDA-approved drugs (imatinib and donepezil) in 36-60% overall yield. The method represents a promising protocol for the late-stage alpha,beta-C(sp(3))-H bond oxidative dual functionalization of tertiary amine-containing drugs and complex natural products.