Access to Spirocyclized Oxindoles and Indolenines via Palladium-Catalyzed Cascade Reactions of Propargyl Carbonates with 2-Oxotryptamines and Tryptamines
作者:Antoinette E. Nibbs、Thomas D. Montgomery、Ye Zhu、Viresh H. Rawal
DOI:10.1021/acs.joc.5b00277
日期:2015.5.15
through a process wherein the first nucleophilic unit on the oxindole or indole reacts with an allenyl-palladium species, formed from oxidative addition of Pd(0) to propargyl carbonates, to generate a π-allyl palladium intermediate that then reacts further with the second nucleophilic component of the oxindole or indole. The cascade process forges two bonds en route to spirocyclized oxindole and indolenine
Cascade Synthesis of 3-Alkylidene Dihydrobenzofuran Derivatives via Rhodium(III)-Catalyzed Redox-Neutral C–H Functionalization/Cyclization
作者:Zhi Zhou、Guixia Liu、Yan Chen、Xiyan Lu
DOI:10.1021/acs.orglett.5b03060
日期:2015.12.4
An efficient rhodium(III)-catalyzed coupling reaction of N-phenoxyacetamides with propargyl carbonates to yield 3-alkylidene dihydrobenzofuran derivatives via C–H functionalization/cascade cyclization has been developed. This transformation represents a redox-neutral process and features the formation of three new bonds under mild conditions.
Nickel-Catalyzed α-1,3-Dienylation of 1,3-Dicarbonyl Compounds with Propargylic Carbonates
作者:Naoki Ishida、Masahiro Murakami、Yuka Kamino
DOI:10.1055/a-1282-9731
日期:2021.10
Herein reported is a nickel-catalyzed α-1,3-dienylation reaction of 1,3-dicarbonylcompounds with substituted propargylic (e.g., but-2-ynyl) carbonates. The propargyl unit changes into a 1,3-dienyl unit, which is incorporated at the α-position of the 1,3-dicarbonylcompounds.
A convenient method for the synthesis of 1,3-dienes from readily available compounds is reported. 2-Aryoxy-1,3-dienes are produced stereoselectively by a nickel-catalyzed reaction of propargyl carbonates with phenols. Functional group tolerance is broad to allow iodo, formyl, and boryl groups. The resulting 1,3-dienes are of much synthetic value because they can participate in a wide variety of reactions
Regio‐, Diastereo‐, and Enantioselective Decarboxylative Hydroaminoalkylation of Dienol Ethers Enabled by Dual Palladium/Photoredox Catalysis
作者:Jun Zheng、Nana Tang、Hui Xie、Bernhard Breit
DOI:10.1002/anie.202200105
日期:2022.5.9
(HAA) reaction of N-aryl α-amino acids with dienol ethers enabled by a photoredox/palladium dual catalytic system is presented. With the developed method, a broad variety of substrates was deployed to deliver vicinal amino tertiary ethers in good to excellent yields with excellent diastereo-, and enantioselectivity. Mechanistic studies suggest that this transformation proceeds through a reversible