Palladium-Catalyzed Aminomethylative Oppolzer-Type Cyclization of Enynes: Access to Aminomethylated Benzofulvenes
作者:Renbin Huang、Bangkui Yu、Renren Li、Hanmin Huang
DOI:10.1021/acs.orglett.1c03720
日期:2021.12.17
A novel palladium-catalyzed Oppolzer-type cyclization reaction aided by the aminomethyl cyclopalladated complex has been developed, which provides rapid access to functionalized benzofulvenes with excellent stereoselectivity. The corresponding products can undergo Diels–Alder reaction with maleimides, providing a series of complex polycyclic compounds with excellent regio- and stereoselectivities.
Brønsted acid catalysed chemo- and <i>ortho</i>-selective aminomethylation of phenol
作者:Zhiqiong Tang、Dongdong Li、Yidi Yue、Dan Peng、Lu Liu
DOI:10.1039/d1ob00820j
日期:——
We have developed a Brønsted acidcatalysed highly ortho-selective functionalization of free phenols with readily available N,O-acetals under mild conditions, furnishing various corresponding aminomethylated phenol products in moderate to excellent yields. The salient features of this transformation include mild conditions, good substrate scope, excellent ortho-selectivity, high efficiency, and ease
Lewis Acid Catalyzed Electrophilic Aminomethyloxygenative Cyclization of Alkynols with <i>N</i>,<i>O</i>-Aminals
作者:Anrong Chen、Houjian Yu、Jiaqi Yan、Hanmin Huang
DOI:10.1021/acs.orglett.9b04630
日期:2020.1.17
Lewis acid enables the electrophilic carbooxygenative cyclization of alkynols with N,O-aminals. The new process proceeds efficiently under very mild conditions via a pathway that is opposite to classical carbo-metalation. These reactions exhibit broad substrate generality and functional group compatibility, leading to a wide variety of 5-8-membered oxacycles bearing diverse functional groups. The cyclization
Palladium-catalyzed formal insertion of carbenoids into <i>N</i>,<i>O</i>-aminals: direct access to α-alkoxy-β-amino acid esters
作者:Wenhui Wang、Hanmin Huang
DOI:10.1039/c9cc01374a
日期:——
has been developed to synthesize α-alkoxy-β-amino acidesters via palladium-catalyzed selective formal insertion of carbenoids into N,O-aminals under mild reaction conditions. A broad range of α-diazoesters with different substituents and various N,O-aminals were compatible with this protocol, affording the corresponding α-alkoxy-β-amino acidesters in good to excellent yields.
catalytic reduction of propargyl carbonates to allenes mediated by a nickel molecular catalyst. The catalytic system uses light as the driving force and amine as the sole hydrogen source. Contrary to other catalytic approaches, the process proceeds without the intermediacy of metal hydride species. The commonly observed pathway in transitionmetalcatalyzed reductive processes is replaced by a pathway
在此,我们报道了由镍分子催化剂介导的碳酸炔丙酯催化还原为丙二烯。该催化系统使用光作为驱动力,胺作为唯一的氢源。与其他催化方法相反,该过程的进行无需金属氢化物物质的中介。过渡金属催化还原过程中常见的途径被涉及一系列电子转移和质子转移的途径所取代。使用这种催化方法,可以在温和条件下获得多种丙二烯。实验研究支持三烷基胺作为还原剂和质子源的双重作用,并揭示了该反应的关键机理特征。提出了Ni( II ) 联烯基中间体的关键原脱镍步骤来解释还原过程。最后,我们还证明选择性 S N 2 ' 还原过程也可以通过电化学方法有效驱动。