A one-pot regioselective synthetic route to vinyl sulfones from terminal epoxides in aqueous media
作者:Ruchi Chawla、Ritu Kapoor、Atul K. Singh、Lal Dhar S. Yadav
DOI:10.1039/c2gc16664j
日期:——
A highly efficient LiBr catalysed regioselective synthesis of vinyl sulfones from readily available terminal epoxides and sodium sulfinates in a one-pot procedure using water as a reaction medium is reported. The protocol is adorned with several attributes of green chemistry like recycling of the catalyst, atom-economy and an aqueous medium.
towards phosphineoxides and phosphonates has been successfully developed through the desulfonative coupling of various sulfones with secondary phosphineoxides and phosphites. This protocol features simple experimental procedures under mild conditions (i. e., catalyst‐ and oxidant‐free, room temperature and open to air). By doing so, a variety of alkynyl, alkenyl and allyl phosphineoxides or phosphonates
Phenylglyoxylic Acid: An Efficient Initiator for the Photochemical Hydrogen Atom Transfer C−H Functionalization of Heterocycles
作者:Giorgos N. Papadopoulos、Maroula G. Kokotou、Nikoleta Spiliopoulou、Nikolaos F. Nikitas、Errika Voutyritsa、Dimitrios I. Tzaras、Nikolaos Kaplaneris、Christoforos G. Kokotos
DOI:10.1002/cssc.202001892
日期:2020.11.20
C−H functionalization at the α‐position of heterocycles has become a rapidly growing area of research. Herein, a cheap and efficient photochemical method was developed for the C−H functionalization of heterocycles. Phenylglyoxylic acid (PhCOCOOH) could behave as an alternative to metal‐based catalysts and organic dyes and provided a very general and wide array of photochemical C−H alkylation, alkenylation
Alkenylation and allylation of alkyl iodides with alkenyl and allylsulfones, respectively, took place under Pd/photoirradiation system. The initial alkyl radical, derived from a single electron transfer between Pd(0) and RI, underwent the title transformations. Pd(0) was regenerated through a reductive elimination of PhSO2PdI, which is formed by the combination of the sulfonyl radical and the palladium
An unexpected regioselectivesynthesis of vinyl triflones was developed. This iodine-mediated C–H triflylation of styrenes with CF3SO2Na occurred at room temperature affording various vinyl triflones, which could be used for the preparation of other CF3SO2-containing compounds.
出人意料的区域选择性合成乙烯基三氟甲磺酸酯。这种碘介导的苯乙烯与CF 3 SO 2 Na的C–H三氟甲烷化反应在室温下发生,提供了各种乙烯基三氟甲酮,可用于制备其他含CF 3 SO 2的化合物。