HF–Pyridine: A Versatile Promoter for Monoacylation/Sulfonylation of Phenolic Diols and for Direct Conversion of t-Butyldimethylsilyl Ethers to the Corresponding Acetates
Palladium‐Catalyzed Reductive Carbonylation of (Hetero) Aryl Halides and Triflates Using Cobalt Carbonyl as CO Source
作者:Bhushanarao Dogga、C. S. Ananda Kumar、Jayan T. Joseph
DOI:10.1002/ejoc.202001328
日期:2021.1.15
A generalized protocol for the reductive carbonylation of (hetero) aryl halides and triflates under CO gas‐free conditions using Pd/Co2(CO)8 and triethylsilane has been developed. The mild reaction conditions, enhanced safety, and wide substrate scope highlight its importance in routine organic synthesis.
已经开发了一种通用协议,用于在无CO气体条件下使用Pd / Co 2(CO)8和三乙基硅烷对(杂)芳基卤化物和三氟甲磺酸进行还原羰基化。温和的反应条件,增强的安全性和广泛的底物范围突出了其在常规有机合成中的重要性。
Synthesis of α-Aryl Nitriles through Palladium-Catalyzed Decarboxylative Coupling of Cyanoacetate Salts with Aryl Halides and Triflates
作者:Rui Shang、Dong-Sheng Ji、Ling Chu、Yao Fu、Lei Liu
DOI:10.1002/anie.201006763
日期:2011.5.2
Worth its salt: The palladium‐catalyzed decarboxylativecoupling of the cyanoacetate salt as well as its mono‐ and disubstituted derivatives with aryl chlorides, bromides, and triflates is described (see scheme). This reaction is potentially useful for the preparation of a diverse array of α‐arylnitriles and has good functional group tolerance. S‐Phos=2‐(2,6‐dimethoxybiphenyl)dicyclohexylphosphine)
zinc bromides and regioconvergent Negishi coupling with aryl or alkenyl triflates. The use of a suitable phosphine ligand favoring Pd migration enabled the selective formation of the linear cross‐coupling product. Subsequently, mixtures of secondary alkyl bromides were prepared from linear alkanes by standard bromination, and regioconvergent cross‐coupling then provided access to the corresponding linear
Palladium-Catalyzed C–P(III) Bond Formation by Coupling ArBr/ArOTf with Acylphosphines
作者:Xingyu Chen、Hongyu Wu、Rongrong Yu、Hong Zhu、Zhiqian Wang
DOI:10.1021/acs.joc.1c00937
日期:2021.7.2
differential phosphination reagents is reported. The acylphosphines show practicable reactivity with ArBr and ArOTf as the phosphination reagents, though they are inert to the air and moisture. The reaction affords trivalent phosphines directly in good yields with a broad substrate scope and functional group tolerance. This reaction discloses the acylphosphines’ capability as new phosphorus sources for the direct
A general palladium-catalyzedreductivecarbonylation of aryl triflates in the presence of synthesis gas (CO/H 2 ) has been developed. The reaction with this most simple and environmentally benign formylation source proceeds under mild conditions and various aromatic aldehydes have been prepared in good to high yield.