Intermolecular Three-Component Synthesis of Fluorene Derivatives by a Rhodium-Catalyzed Stitching Reaction/Remote Nucleophilic Substitution Sequence
作者:Masaki Nishida、Donghyeon Lee、Ryo Shintani
DOI:10.1021/acs.joc.0c00790
日期:2020.7.2
fluorene derivatives has been developed by devising a rhodium-catalyzed stitching reaction/remote nucleophilic substitution sequence. A variety of nucleophiles can be installed in the second step including both heteroatom and carbon nucleophiles. An efficient synthesis of 5H-benzo[a]fluoren-5-ones has also been realized using N-(2-alkynyl)benzoylpyrrole as the reaction partner through a new reaction pathway
通过设计铑催化的拼接反应/远程亲核取代序列,已经开发了多取代芴衍生物的三组分合成方法。第二步中可以安装各种亲核试剂,包括杂原子亲核试剂和碳亲核试剂。N-(2-炔基)苯甲酰基吡咯通过新的反应路径作为反应伙伴,也已经实现了5 H-苯并[ a ]芴-5-酮的高效合成。
Platinum-Catalyzed Chemoselectively Hydrative Dimerization of 2-Alkynyl-1-acetylbenzenes for One-Pot Facile Synthesis of Chrysene Derivatives
作者:Arindam Das、Hsuan-Hung Liao、Rai-Shung Liu
DOI:10.1021/jo701580r
日期:2007.11.1
We report one-pot syntheses of chrysene compounds via PtCl2-catalyzed hydrative dimerization of readily available 2-alkynyl-1-acetylbenzenes. This new tandem catalysis comprises an initial selective hydration of the alkyne, followed by chemoselective dimerization of diketone intermediates. The mechanism of this cyclization has been elucidated by 13C labeling experiments as well as isolation of reaction
The present invention is directed to a substituted phenylethynylgold-nitrogen-containing heterocyclic carbene complex represented by the formula (1) or (2):
wherein L represents a nitrogen-containing heterocyclic carbene ligand, and X represents an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group, a heterocyclic group, an alkoxy group, an aryloxy group, an alkylmercapto group, an arylmercapto group or a substituted amino group; and one or a plural number of hydrogen atoms on the carbon atom(s) of X are independently optionally replaced by a halogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group, an aralkyl group, an alkoxy group, an aryloxy group, an alkylmercapto group, an arylmercapto group or a substituted amino group.
Pt<sup>II</sup>-Catalyzed Synthesis of 9-Oxabicyclo[3.3.1]nona-2,6-dienes from 2-Alkynyl-1-carbonylbenzenes and Allylsilanes by an Allylation/Annulation Cascade