Regioselective hydrations of 1-aryl-3-en-1-ynes using gold and platinum catalysts: selective production of 2-en-1-ones and 3-en-1-ones
作者:Bhanudas Dattatray Mokar、Rai-Shung Liu
DOI:10.1039/c4cc02786h
日期:——
Regiocontrolled hydrations of 1-aryl-3-en-1-ynes have been accomplished with IPrAuOTf and PtCl2/CO to yield 3-en-1-ones and 2-en-1-ones efficiently; our experimental data indicates that the sizes of catalysts play an important role.
Regio‐ and Stereoselective Cascade of β,γ‐Unsaturated Ketones by Dipeptided Phosphonium Salt Catalysis: Stereospecific Construction of Dihydrofuro‐Fused [2,3‐b] Skeletons
作者:Hongkui Zhang、Jiajia He、Yayun Chen、Cheng Zhuang、Chunhui Jiang、Kai Xiao、Zhishan Su、Xiaoyu Ren、Tianli Wang
DOI:10.1002/anie.202106046
日期:2021.9
heterocyclic molecules in high yields with excellent stereoselectivities. Moreover, mechanistic investigations revealed that the bifunctional phosphonium salt controlled the regio- and stereoselectivities of this cascade reaction, particularly proceeding through the initial ketone α-addition followed by O-participated substitution; and the multiple hydrogen-bonding interactions between Brønstedacid moieties
Base-Catalyzed Stereoselective Vinylation of Ketones with Arylacetylenes: A New C(sp3)C(sp2) Bond-Forming Reaction
作者:Boris A. Trofimov、Elena Yu. Schmidt、Igor' A. Ushakov、Nadezhda V. Zorina、Elena V. Skital'tseva、Nadezhda I. Protsuk、Al'bina I. Mikhaleva
DOI:10.1002/chem.201000227
日期:——
those with condensed aromatic moieties, are readily vinylated with arylacetylenes (KOH/DMSO, 100 °C, 1 h) to give regio‐ and stereoselectively the (E)‐β‐γ‐ethylenic ketones ((E)‐3‐buten‐1‐ones) in 61–84 % yields and with approximately 100 % stereoselectivity. This vinylation represents a newC(sp3)C(sp2) bond‐forming reaction of high synthetic potential.
Regioselective Synthesis of 2-Acylbutadienes from β,γ-Unsaturated Ketones
作者:Dmitrii A. Shabalin、Elena V. Ivanova、Igor A. Ushakov、Elena Yu. Schmidt、Boris A. Trofimov
DOI:10.1055/s-0039-1690003
日期:2019.10
dienes in up to 94% yield. 2-Acylbuta-1,3-dienes have been synthesized regioselectively from aromatic and heteroaromatic β,γ-unsaturated ketones (readily accessible via base-catalyzed addition of ketones to acetylenes) and aldehydes. The reaction smoothly proceeds with piperidine (10 mol%)/acetic acid (10 mol%) catalytic pair in boiling toluene to provide synthetically attractive polyconjugated electron-deficient
Direct Asymmetric α‐Selective Mannich Reaction of β,γ‐Unsaturated Ketones with Cyclic α‐Imino Ester: Divergent Synthesis of Cyclocanaline and Tetrahydro Pyridazinone Derivatives
作者:Yu‐Huan Geng、Yuan‐Zhao Hua、Shi‐Kun Jia、Min‐Can Wang
DOI:10.1002/chem.202100284
日期:2021.3.17
The first regio‐, diastereo‐, and enantioselective direct Mannich reaction of β,γ,‐unsaturated ketones with benzoxazinone cyclic imines was enabled by Lewis acid/Brønsted base cooperative catalysis. The dinuclearzinc complex catalyzed the reaction of a broad range of β,γ‐unsaturated ketones to proceed at the α‐site exclusively, leading to corresponding adducts with two consecutive tertiary carbon
路易斯酸/布朗斯台德碱协同催化作用使β,γ-不饱和酮与苯并恶嗪酮环状亚胺进行了第一个区域,非对映和对映选择性的直接曼尼希反应。双核锌络合物催化广泛的β,γ-不饱和酮反应仅在α位进行,从而导致相应的加合物具有两个连续的叔碳立体中心,其非对映异构体比例高达> 20:1,并且通常具有对映选择性在90–99%ee范围内。这些产物被用作一般中间体,用于合成多取代的环茶碱,四氢哒嗪酮和4 H-呋喃[2,3- b ] [1,4]苯并恶嗪衍生物。