Ruthenium-catalyzed hydrogenation of CO<sub>2</sub> as a route to methyl esters for use as biofuels or fine chemicals
作者:Zheng Wang、Ziwei Zhao、Yong Li、Yanxia Zhong、Qiuyue Zhang、Qingbin Liu、Gregory A. Solan、Yanping Ma、Wen-Hua Sun
DOI:10.1039/d0sc02942d
日期:——
diphosphine–ruthenium(II) complex has been developed that can efficiently catalyze both the hydrogenation of CO2 to methanol and its in situ condensation with carboxylic acids to form methyl esters; a TON of up to 3260 is achievable for the CO2 to methanol step. Both aromatic and aliphatic carboxylic acids can be transformed to their corresponding methyl esters with high conversion and selectivity (17 aliphatic
SO<sub>2</sub>F<sub>2</sub>-Mediated One-Pot Synthesis of Aryl Carboxylic Acids and Esters from Phenols through a Pd-Catalyzed Insertion of Carbon Monoxide
作者:Wan-Yin Fang、Jing Leng、Hua-Li Qin
DOI:10.1002/asia.201700891
日期:2017.9.5
A one-pot Pd-catalyzed carbonylation of phenols into their corresponding aryl carboxylic acids and esters through the insertion of carbon monoxide has been developed. This procedure offers a direct synthesis of aryl carboxylic acids and esters from inexpensive and abundant starting materials (phenols, SO2F2 and CO) under mild conditions. This method tolerates a broad range of functional groups and
通过一氧化碳的插入,一锅Pd催化苯酚将羰基羰基化为相应的芳基羧酸和酯。该方法可在温和的条件下,由廉价而丰富的起始原料(苯酚,SO 2 F 2和CO)直接合成芳基羧酸和酯。该方法可耐受多种官能团,也可用于复杂天然产物的修饰。
Palladium-Catalyzed Carbonylation Reactions of Aryl Bromides at Atmospheric Pressure: A General System Based on Xantphos
作者:Joseph R. Martinelli、Donald A. Watson、Dominique M. M. Freckmann、Timothy E. Barder、Stephen L. Buchwald
DOI:10.1021/jo801279r
日期:2008.9.19
A method for the Pd-catalyzed carbonylation of aryl bromides has been developed usingXantphos as the ligand. This method is effective for the direct synthesis of Weinreb amides, primary and secondary benzamides, and methyl esters from the corresponding aryl bromides at atmosphericpressure. In addition, a putative catalytic intermediate, (Xanphos)Pd(Br)benzoyl, was prepared and an X-ray crystal structure
Aromatics from pyrones: esters of terephthalic acid and isophthalic acid from methyl coumalate
作者:George A. Kraus、Gerald R. Pollock III、Christie L. Beck、Kyle Palmer、Arthur H. Winter
DOI:10.1039/c3ra42287a
日期:——
competing transition states of the para-selective Diels–Alderreactions are in good agreement with experiment. The surprising regioselectivity of methyl coumalate with activated alkenes is attributed to a secondaryorbitalinteraction between the pyrone oxygen and the dienophile LUMO, which switches the regiochemistry expected from simple frontier molecular orbital theory arguments.
The First General and Selective Palladium(II)-Catalyzed Alkoxycarbonylation of Arylboronates: Interplay among Benzoquinone-Ligated Palladium(0) Complex, Organoboron, and Alcohol Solvent
作者:Yoshihiko Yamamoto
DOI:10.1002/adsc.200900836
日期:2010.2.15
Methoxycarbonylation of aryl- and alkenylboron compounds was performed using the palladium(II) acetate/triphenylphosphine [Pd(OAc)2/PPh3] catalyst with p-benzoquinone as a stoichiometric oxidant in methanol at ambient temperature to obtain the corresponding methyl esters in good yields. A wide variety of functional groups including various carbonyl functionalities, nitrile, nitro, sulfone, and unprotected