Triphenylphosphine-Catalyzed Alkylative Iododecarboxylation with Lithium Iodide under Visible Light
作者:Ming-Chen Fu、Jia-Xin Wang、Rui Shang
DOI:10.1021/acs.orglett.0c03173
日期:2020.11.6
light-emitting diodes, PPh3 catalyzes the iododecarboxylation of aliphatic carboxylic acid derived N-(acyloxy)phthalimide with lithiumiodide as an iodine source. The reaction delivers primary, secondary, and bridgehead tertiary alkyl iodides in acetone solvent, and the alkyl iodide products were easily used to generate C–N, C–O, C–F, and C–S bonds to allow various decarboxylative transformations without
Decarboxylative cross-nucleophile coupling via ligand-to-metal charge transfer photoexcitation of Cu(ii) carboxylates
作者:Qi Yukki Li、Samuel N. Gockel、Grace A. Lutovsky、Kimberly S. DeGlopper、Neil J. Baldwin、Mark W. Bundesmann、Joseph W. Tucker、Scott W. Bagley、Tehshik P. Yoon
DOI:10.1038/s41557-021-00834-8
日期:2022.1
nucleophiles under visible-light irradiation. Preliminary mechanistic studies suggest that the relevant chromophore in this reaction is a Cu(ii) carboxylate species assembled in situ. We propose that visible-light excitation to a ligand-to-metal chargetransfer (LMCT) state results in a radical decarboxylation process that initiates the oxidative cross-coupling. The reaction is applicable to a wide
能够形成碳-氮、碳-氧和碳-碳键的反应是合成化学的核心。然而,通常需要底物预功能化来实现此类转化,而无需强制反应条件。因此,开发丰富的原料化学品的直接偶联方法对于快速构建复杂的分子支架是非常必要的。在这里,我们报道了在可见光照射下羧酸与多种亲核试剂的铜介导的净氧化脱羧偶联。初步机理研究表明,该反应中的相关生色团是原位组装的 Cu( ii ) 羧酸盐物种。我们提出,可见光激发配体到金属的电荷转移(LMCT)状态会导致自由基脱羧过程,从而引发氧化交叉偶联。该反应适用于多种偶联伙伴,包括复杂的药物分子,表明这种交叉亲核偶联策略将促进快速化合物库合成,以发现新的药物制剂。
Alkene Synthesis by Photocatalytic Chemoenzymatically Compatible Dehydrodecarboxylation of Carboxylic Acids and Biomass
作者:Vu T. Nguyen、Viet D. Nguyen、Graham C. Haug、Hang T. Dang、Shengfei Jin、Zhiliang Li、Carsten Flores-Hansen、Brenda S. Benavides、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/acscatal.9b02951
日期:2019.10.4
O–H hydrogen atom transfer (HAT) and cobaloxime-catalyzed C–H-HAT processes. The reaction produces a variety of alkenes from readily available carboxylic acids. The reaction can be embedded in a scalable triple-catalytic cooperative chemoenzymatic lipase–acridine–cobaloxime process that allows for direct conversion of plant oils and biomass to long-chain terminal alkenes, precursors to bioderived polymers
esters is demonstrated. This protocol efficiently installs various tertiary or secondary alkyl fragments onto the nitrogen atom of azole nucleophiles undermild and transition-metal-free conditions. The pyridinium additive successfully inhibits the formation of elimination byproducts from the carbocation intermediate. This reaction is applicable to the synthesis of a protein-degrader-like molecule
demonstrate a dual organophotoredox/copper catalytic strategy toward challenging decarboxylative olefination processes proceeding in high yields and selectivities. This operationally simple method uses photoactive organic molecules and Cu(II)-complexes as catalysts to provide rapid access to a wide variety of olefins from inexpensive synthetic and biomass-derived carboxylic acids under mild light-mediated conditions