Combining Silver Catalysis and Organocatalysis: A Sequential Michael Addition/Hydroalkoxylation One-Pot Approach to Annulated Coumarins
摘要:
A highly stereoselective one-pot procedure for the synthesis of five-membered annulated hydroxycoumarins has been developed. By merging primary amine catalysis with silver catalysis, a series of functionalized coumarin derivatives were obtained in good yields (up to 91%) and good to excellent enantioselectivities (up to 99% ee) via a Michael addition/hydroalkoxylation reaction. Depending on the substituents on the enynone, the synthesis of annulated six-membered rings is also feasible.
[EN] 1,4-DISUBSTITUTED PIPERIDINE DERIVATIVES AND THEIR USE AS 11-BETAHSD1 INHIBITORS<br/>[FR] DERIVES DE PIPERIDINE 1,4 DISUBSTITUEE ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE 11-BETAHSD1
申请人:ASTRAZENECA AB
公开号:WO2004033427A1
公开(公告)日:2004-04-22
The use of a compound of formula (I) in the manufacture of a medicament for use in the inhibition of 11βHSD1 is described.
Enantioselective decarboxylative Mannich reaction of β-keto acids with <i>C</i>-alkynyl <i>N</i>-Boc <i>N</i>,<i>O</i>-acetals: access to chiral β-keto propargylamines
作者:Cong-Cong Zhang、Li-Jun Chen、Bao-Chun Shen、Hui-Ding Xie、Wei Li、Zhong-Wen Sun
DOI:10.1039/d1ob01555a
日期:——
related synthetic approaches remain limited. Therefore, a concise and efficient method for the enantioselective synthesis of β-keto propargylamines via chiral phosphoric acid-catalyzed asymmetric Mannichreaction between β-keto acids and C-alkynyl N-Boc N,O-acetals as easily available C-alkynyl imine precursors has been demonstrated here, affording a broad scope of β-keto N-Boc-propargylamines in high
手性酮基取代的炔丙基胺是有机和药物合成领域必不可少的一类多功能化合物,受到了广泛关注,但相关的合成方法仍然有限。因此,通过手性磷酸催化 β-酮酸与C-炔基 N - Boc N , O-缩醛作为容易获得的C-炔基亚胺前体的不对称曼尼希反应,一种简洁有效的对映选择性合成 β-酮炔丙基胺的方法这里已经证明,提供广泛的 β-酮N-Boc-炔丙基胺具有高产率(高达 97%),通常具有高对映选择性(高达 97 : 3 er)。
Controllable Site-Selective Construction of 2- and 4-Substituted Pyrimido[1,2-<i>b</i>]indazole from 3-Aminoindazoles and Ynals
作者:Xiang Liu、Jinlei Zhou、Jiatong Lin、Zemin Zhang、Suying Wu、Qiuxing He、Hua Cao
DOI:10.1021/acs.joc.1c01094
日期:2021.7.2
straightforward and novel controllable site-selective construction of 2- and 4-substituted pyrimido[1,2-b]indazole from 3-aminoindazoles and ynals has been developed. The high regioselectivity of this reaction could be easily switched by converting different catalytic systems. In this way, a series of 2- and 4-substituted pyrimido[1,2-b]indazole derivatives were obtained in moderate to good yields. In addition, the
已经开发出一种由 3-氨基吲唑和 ynals 直接且新颖的可控位点选择性构建 2-和 4-取代的嘧啶并[1,2 -b ]吲唑的方法。该反应的高区域选择性可以通过转换不同的催化体系轻松切换。通过这种方式,以中等至良好的收率获得了一系列2-和4-取代的嘧啶并[1,2- b ]吲唑衍生物。此外,还讨论了本方法制备的化合物3a的光物理性质。
Highly Regio- and Stereoselective Synthesis of <i>Z</i> and <i>E</i> Enol Esters by an Amine-Catalyzed Conjugate Addition–Rearrangement Reaction of Ynals with Carboxylic Acids
作者:He Huang、Xinshuai Zhang、Chenguang Yu、Xiangmin Li、Yueteng Zhang、Wei Wang
DOI:10.1021/acscatal.6b02206
日期:2016.12.2
The broad synthetic utility of labile enolesters demands efficient methods for the stereo- and regioselectivesynthesis of both Z and E isomers. The available synthetic methods dominated by metal catalysis cannot meet the challenge. We wish to report a metal-free organocatalytic divergent approach to both E and Z isomers of enolesters from the same reactant pools with the same catalytic system. A
Benzannulation of Substituted 3-Alkoxycarbonylhex-3-en-5-ynoic Acids: A New Route to 4-Substituted 3,5-Dihydroxybenzoic Acids Derivatives
作者:Stefano Serra、Claudio Fuganti
DOI:10.1055/s-2002-34212
日期:——
A new regioselective pathway to 4-substituted 3,5-dihydroxybenzoic acids derivatives is described here. According to this procedure substituted propargylic aldehydes are converted into substituted 3-alkoxycarbonylhex-3-en-5-ynoic acids, which are in turn, treated with acetic anhydride in the presence of sodium acetate to give the substituted benzoic acids derivatives. The aromatic moiety constructed