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。
Diastereo‐ and Enantioselective Synthesis of Bisbenzannulated Spiroketals and Spiroaminals by Ir/Ag/Acid Ternary Catalysis
作者:Wu‐Lin Yang、Xin‐Yu Shang、Tao Ni、Hui Yan、Xiaoyan Luo、Hanliang Zheng、Zhong Li、Wei‐Ping Deng
DOI:10.1002/anie.202210207
日期:2022.10.17
allylation/spiroketalization cascade reaction of o-alkynylacetophenones and (1-hydroxyallyl)phenols enabled by Ir/Ag/acidternarycatalysis was developed, affording structurally diverse bisbenzannulated [6,6]-spiroketals in high efficiency with mostly high diastereoselectivities and excellent enantioselectivities.
Ag(<scp>i</scp>)-catalyzed cyclization of <i>o</i>-alkynylacetophenones facilitated through acetal formation: synthesis of C3-naphthyl indole derivatives
an efficient synthesis of C3-naphthyl indoles from o-alkynylacetophenones has been developed. This Ag-catalyzed transformation is assisted by the acetal formed under the reaction condition employing trimethyl orthoformate (TMOF). The role of acetal in promoting the reaction under ambient conditions has been established with control experiments. A range of C3-naphthyl indolederivatives have been synthesized
开发了一种从邻炔基苯乙酮高效合成 C3-萘基吲哚的温和方法。在使用原甲酸三甲酯 (TMOF) 的反应条件下形成的缩醛有助于这种 Ag 催化的转化。缩醛在环境条件下促进反应的作用已经通过对照实验确定。已经合成了一系列 C3-萘基吲哚衍生物,收率中等到非常高。
Compatibility Assessment of Unactivated Internal Alkynes in Rhodium-Catalyzed [2+2+2] Cycloadditions
作者:Allan J. B. Watson、John M. Halford-McGuff、Aidan P. McKay
DOI:10.1055/a-2285-0007
日期:——
Rh-catalyzed [2+2+2] cycloaddition of a diyne and internal alkyne offers a seemingly straightforward route to these scaffolds; however, this has been largely restricted to alkynes bearing activating (coordinating) functional groups, with very few examples of unactivated alkynes. In this work, we disclose an assessment of Rh-catalyzed [2+2+2] cycloadditions employing unactivated internal alkynes, focusing
A copper-catalyzed aminobenzannulation of (o-alkynyl)arylketones with amines has been developed. This method features the use of a cheap copper catalyst, the facile annulation involving various amines, and the good functional group tolerance.