Palladium-Catalyzed Carbonylative Cross-Coupling Reaction
between Aryl(Heteroaryl) Iodides and Tricyclopropylbismuth:
Expedient Access to Aryl Cyclopropylketones
The carbonylative cross-coupling reaction between aryl and heteroaryl iodides and tricyclopropylbismuth is reported. The reaction is catalyzed by (SIPr)Pd(allyl)Cl, a NHC-palladium(II) catalyst, operates under 1 atm of carbon monoxide and tolerates a wide range of functional groups. The use of lithium chloride was found to provide higher yields of the desired aryl cyclopropylketones. The conditions
报道了芳基和杂芳基碘化物与三环丙基铋之间的羰基化交叉偶联反应。该反应由 (SIPr)Pd(烯丙基)Cl 催化,这是一种 NHC-钯 (II) 催化剂,在 1 个大气压的一氧化碳下运行,并能耐受多种官能团。发现使用氯化锂可提供更高产率的所需芳基环丙基酮。该条件也适用于碘代烯烃的羰基化交叉偶联,以提供相应的烯基环丙基酮。
Brønsted acid mediated intramolecular cyclopropane ring expansion/[4 + 2]-cycloaddition
作者:Jian Li、Shangrong Zhu、Qiuneng Xu、Li Liu、Shenghu Yan
DOI:10.1039/c9ob02379h
日期:——
A cascade reaction of 3-hydroxy-2-phenylisoindolin-1-one and cyclopropyl ketone has been developed via a BrØnsted acid-promoted ring-opening/intramolecular cross-cycloaddition/[4 + 2]-cycloaddition process. The developed methodology provides straightforward access to pentacyclic isoindolin-1-one derivatives under simple reaction conditions.
Nickel-Catalyzed Regioselective Reductive Ring Opening of Aryl Cyclopropyl Ketones with Alkyl Bromides
作者:Bing Yuan、Decai Ding、Chuan Wang
DOI:10.1021/acscatal.2c00677
日期:2022.4.15
Herein, we report the successful implementation of reductive strategy in the ring opening reaction of aryl cyclopropyl ketones with unactivated alkyl bromides. Under the catalysis of nickel, this reductive Csp3–Csp3 cross-coupling reaction proceeds with complete regioselectivity and bypasses the use of pregenerated organometallics, enabling efficient synthesis of alkylated ketones with high step economy
copper-catalyzed borylation of unactivated vinylcyclopropanes to form six-membered cyclic borate salts. A copper complex bearing an N-heterocyclic ligand in combination with bis(pinacolato)diboron and LiOtBu catalyzes the ring-opening of the substrate under mild reaction conditions. The protocol can be applied to aryl- and heteroaryl-substituted vinylcyclopropanes and can be conducted on a gram scale. The
我们报道了未活化乙烯基环丙烷的铜催化硼基化形成六元环状硼酸盐。带有 N-杂环配体的铜配合物与双(频哪醇)二硼和 LiO t Bu 结合,在温和的反应条件下催化底物的开环。该方案可应用于芳基和杂芳基取代的乙烯基环丙烷,并且可以在克规模上进行。环状硼酸盐锂盐的合成用途已通过区域选择性开环官能化得到证实。
ELLIOTT M.; FARNHAM A. W.; JANES N. F.; JOHNSON D. M.; PULMAN D. A., PESTIC. SCI., 1980, 11, NO 5, 513-525
作者:ELLIOTT M.、 FARNHAM A. W.、 JANES N. F.、 JOHNSON D. M.、 PULMAN D. A.