Highly Regioselective Synthesis of 1,3-Diiodonaphthalene Derivatives via a Sequential Cascade Iodocyclization
摘要:
A novel and flexible sequentially cascade iodocyclization for the synthesis of highly substituted 1,3-diiodinated naphthalene derivatives in up to 99% yield under mild conditions is reported. The dihalogenated moiety can be readily introduced into the naphthalenes in a position that is usually not easily functionalized.
在这项工作中,我们描述了一系列 6,7-二氢-5H-苯并[ c ]芴的构建。它们的合成基于三环底物的分子内环化,三环底物在环境温度下的酸性条件下具有醇官能团。某些反应优化条件表明,三氟甲磺酸是该转化最方便的试剂,以 37% 至 93% 的产率提供范围广泛的芴衍生物。我们通过克级合成以及二氢茚并[ c ]-色烯硫色烯和薁烯衍生物的制备来说明该方法的稳健性。
One-Pot Synthesis of Spirocyclopenta[<i>a</i>]indene Derivatives via a Cascade Ring Expansion and Intramolecular Friedel–Crafts-Type Cyclization
作者:Quanzhe Li、Jiaxin Liu、Yin Wei、Min Shi
DOI:10.1021/acs.joc.9b03126
日期:2020.2.21
A one-pot efficient synthetic approach for the rapid construction of spirocyclopenta[a]indene derivatives has been developed via an iodine-initiated cascade ring expansion and intramolecular Friedel-Crafts-type cyclization from propargyl alcohol-tethered alkylidenecyclobutanes under mild conditions with broad substrate scope. This cascade process can be elegantly conducted on a gram scale. A plausible
Palladium-catalyzed <i>ortho</i>-halogen-induced deoxygenative approach of alkyl aryl ketones to 2-vinylbenzoic acids
作者:Shankar Ram、Ajay Kumar Sharma、Arvind Singh Chauhan、Pralay Das
DOI:10.1039/d0cc02941f
日期:——
polymer chemistry and are key precursors for the synthesis of important bioactive molecules. Herein, an ortho-halogen-induced deoxygenative approach for the generation of 2-vinylbenzoic acids from alkylarylketones by palladium catalysis is discovered and explored. This approach requires no base or stoichiometric additives and can be carried out through a simple one-step process. Furthermore, the present
A Conjunctive Carboiodination: Indenes by a Double Carbopalladation-Reductive Elimination Domino Process
作者:Xiaodong Jia、David A. Petrone、Mark Lautens
DOI:10.1002/anie.201204716
日期:2012.9.24
Something gained, nothing lost: A Pd0‐catalyzed domino intermolecular/intramolecular process terminated by carbohalogenation is reported. In this reaction, two new CC bonds, one new CI bond and one five‐membered ring are formed in a single step, and all of the atoms in the starting materials are incorporated into the product (see scheme).
C−N Cross‐Coupling Reactions Under Mild Conditions Using Singlet Di‐Radical Nickel(II)‐Complexes as Catalyst: N‐Arylation and Quinazoline Synthesis
作者:Rina Sikari、Suman Sinha、Gargi Chakraborty、Siuli Das、Nicolaas Petrus Leest、Nanda D. Paul
DOI:10.1002/adsc.201900545
日期:2019.9.17
Herein we report a cost‐effective synthetic approach for C−N cross‐coupling reactions of a broad array of nitrogen nucleophiles and aryl halides under mild conditions. These reactions are catalyzed by an inexpensive, air‐stable, earth‐abundant and easy‐to‐prepare singlet di‐radical nickel(II)‐catalyst containing two antiferromagnetically coupled single‐electron oxidized diiminosemiquinonato type ligands
Palladium-Catalyzed Direct Oxidative Coupling of Iodoarenes with Primary Alcohols Leading to Ketones: Application to the Synthesis of Benzofuranones and Indenones
investigated, utilizing readily available primary alcohols as acylating sources. Overall, this oxidative coupling proceeds via three distinct transformations such as oxidation, radical formation, and cross-coupling in one catalytic process. This protocol does not involve the assistance of a directing group or activation of the carbonyl group by any other means. Furthermore, this reaction made use of no