irradiation in the presence of catalytic amounts of [(DPEphos)(bcp)Cu]PF6 and an amine, a range of unactivated aryl and alkyl halides were shown to be smoothly activated through a rare Cu(I)/Cu(I)*/Cu(0) catalytic cycle. This complex efficiently catalyzes a series of radical processes, including reductions, cyclizations, and direct arylation of arenes.
Sulfonyl halide synthesis by thiol oxyhalogenation using NBS/NCS – i PrOH
作者:Carolina Silva-Cuevas、Carlos Perez-Arrieta、Luis A. Polindara-García、J. Armando Lujan-Montelongo
DOI:10.1016/j.tetlet.2017.04.087
日期:2017.6
A rapid and facile method provides a general route to sulfonyl bromides/chlorides by the oxidation of thiols using NXS – ROH (X = Br,Cl, R = iPr) as an oxyhalogenation reagent. Control experiments suggest that the alcohol component is the source of oxygen. The proposed method enable the access to structurally diverse sulfonyl bromides and chlorides including challenging examples, inaccessible by other
一种快速而简便的方法,是使用NXS – ROH(X = Br,Cl,R = i Pr)作为氧卤代试剂氧化硫醇,从而提供了磺酰溴/氯化物的一般途径 。对照实验表明,酒精成分是氧气的来源。所提出的方法使得能够获得结构上不同的磺酰溴和氯化物,包括具有挑战性的实例,这是其他合成方法所无法达到的。
Electroreductive Carbofunctionalization of Alkenes with Alkyl Bromides via a Radical-Polar Crossover Mechanism
作者:Wen Zhang、Song Lin
DOI:10.1021/jacs.0c08532
日期:2020.12.9
variety of alkene functionalization reactions, most of which proceed via an anodic oxidation pathway. In this report, we further expand the scope of electrochemistry to the reductive functionalization of alkenes. In particular, the strategic choice of reagents and reaction conditions enabled a radical-polar crossover pathway wherein two distinct electrophiles can be added across an alkene in a highly
1,2-Dibromotetrachloroethane: an efficient reagent for many transformations bymodified Appel reaction
作者:Selçuk EŞSİZ、Arif DAŞTAN
DOI:10.3906/kim-1804-41
日期:——
been developed for the synthesis of alkyl bromides from various alcohols under mild conditions using a triphenylphosphine (PPh$_3})$/1,2-dibromotetrachloroethane (DBTCE) complex in excellent yields and very short time (5 min). This method can also be applied for the transformation of chiral alcohols to their corresponding bromides in very high enantiomeric excess. The PPh$_3}$/DBTCE complex is also
Introduction of bromine and chlorine substituents in medium ring ethers and lactones
作者:Justin G. Bendall、Andrew N. Payne、Thomas E. O. Screen、Andrew B. Holmes
DOI:10.1039/a701999h
日期:——
A convenient preparation of α-halo enamines using oxalyl halides
is described together with applications of these reagents in the
halogenation of β-hydroxy cyclic ethers and lactones.