We present an allylic polyfluoroarylation reaction with broad substrate scope and excellent functional group tolerance, using organozinc reagents under mild conditions. A catalytic amount of triphenylphosphine oxide efficiently promotes iodine-zinc exchange reaction between polyfluoroaryl iodide and dimethylzinc, and the resulting phosphine oxide-activated polyfluoroarylzinc undergoes substitution reaction with allylic halides to afford the corresponding polyfluoroarylated products. (C) 2015 Elsevier Ltd. All rights reserved.
Thermodynamics of Halogen Bonding in Solution: Substituent, Structural, and Solvent Effects
作者:Mohammed G. Sarwar、Bojan Dragisic、Lee J. Salsberg、Christina Gouliaras、Mark S. Taylor
DOI:10.1021/ja9086352
日期:2010.2.10
demonstrating that both substituent constants (sigma) and calculated molecular electrostatic potential surfaces are useful for constructing such relationships. An electrostatic model is, however, limited in its ability to provide correlation with a more comprehensive data set in which both halogen bond donor and acceptor abilities are varied: the ability of computationally derived binding energies to accurately
In Situ Generation and Trapping of Aryllithium and Arylpotassium Species by Halogen, Sulfur, and Carbon Electrophiles
作者:Ilya Popov、Hien-Quang Do、Olafs Daugulis
DOI:10.1021/jo9015369
日期:2009.11.6
A general method has been developed for in situ trapping of arylmetal intermediates by halogen, sulfur, ketone, and aldehyde electrophiles affording the functionalization of the most acidic position in arene Pentafluorobenzene, benzothiazole,and benzoxazole can be functionalized by using K3PO4 base. For less acidic arenes, tBuOLi base is required. Arenes with DMSO pK(a) values of 35 or less are reactive.
Efficient Suzuki-Miyaura mono-arylation of symmetrical diiodo(hetero)arenes
作者:Alexander Sapegin、Mikhail Krasavin
DOI:10.1016/j.tetlet.2018.04.015
日期:2018.5
A reliable protocol for converting 1,4-diiodo-2,3,5,6-tetrafluorobenzene into 1-(hetero)aryl-4-iodo-2,3,5,6-tetrafluorobenzene derivatives has been lacking in the literature. We have identified optimal conditions to achieve this conversion in good yields and have minimized formation of the bis-coupling product. The newly identified protocol involving the use of a syringe pump has been extended to other symmetrical diiodo(hetero)arenes. (C) 2018 Elsevier Ltd. All rights reserved.