Chemoselective and stereospecific iodination of alkynes using sulfonium iodate(<scp>i</scp>) salt
作者:Dodla S. Rao、Thurpu R. Reddy、Sudhir Kashyap
DOI:10.1039/c7ob03076b
日期:——
An efficient and highly chemoselective iodination of alkynes using a sulfoniumiodate(I) electrophilc reagent under metal-free conditions has been realized. The reactivity of sulfoniumiodate(I) salt could be significantly diverse in the presence of water as the solvent, enabling the (E)-1,2-diiodoalkenes stereospecifically. This stereodivergent approach is amenable to a wide range of alkyne substrates
Abstract Monosubstituted acetylenes were iodinated to form iodoacetylenes under simple conditions. Reaction of aryl acetylenes with molecular iodine in the presence of 4‐dimethylaminopyridine (DMAP) gave the desired products in good to excellent yields. Iodination of aryl acetylenicketones using K2CO3 as base was also described.
Highly efficient synthesis of 2,3,4-trisubstituted furans via silver-catalyzed sequential nucleophilic addition and cyclization reactions of haloalkynes
regioselective synthesis of 2,3,4-trisubstituted furans using AgNO3 catalyst from haloalkynes in a one-pot procedure has been reported. The transformation consists of a sequential silver-catalyzed nucleophilic addition and cyclization reaction of haloalkynes. A wide variety of haloalkynes can be used in this chemical process.
Integrated continuous‐flow/batch protocol for <i>ortho</i>‐selective alkynylation of (hetero)aryl tosylates
作者:Eun‐Hae Ju、Min‐Jung Lee、Jiwoo Song、Yong‐Ju Kwon、Won‐Suk Kim
DOI:10.1002/bkcs.12717
日期:2023.9
The ortho-selective alkynylation of polyhalo-substituted (hetero)aryl tosylates was investigated using an integrated continuous-flow/batch protocol. Without the elimination of the tosyloxy group, the regioselective ortho-metalation of the (hetero)aryl tosylates employing n-BuLi and ZnCl2 was successfully achieved in continuous-flow chemistry within 10.92 s (residence time). The Pd-catalyzed Negishi