Halonium Ion-Assisted Deiodination of Styrene-Based Vicinal Iodohydrins Followed by Rearrangement through Phenyl Migration
摘要:
Acid activation of bromate/bromide couple at 0-10 degrees C was found to trigger the deiodination of styrene-based vicinal iodohydrins. Violet coloration of the organic layer was ascribed to formation of IBr. Deiodination was followed by phenyl migration and deprotonation leading to formation of phenyl acetone and 2-phenylpropanal in good yields from 1-iodo-2-phenylpropan-2-ol and 2-iodo-1-phenylpropan-1-ol, respectively. Phenyl acetaldehyde-which was obtained in 92% GC yield from styrene iodohydrin-was also presumably formed in analogous manner. NBS and HOCl too were effective for transformation of styrene iodohydrin into phenyl acetaldehyde,
Comparative study of the vicinal functionalization of olefins with 2:1 bromide/bromate and iodide/iodate reagents
作者:Manoj K. Agrawal、Subbarayappa Adimurthy、Bishwajit Ganguly、Pushpito K. Ghosh
DOI:10.1016/j.tet.2009.01.095
日期:2009.4
halohydrins, halo methyl ethers, and halo acetates from olefins using 2:1 Br−/BrO3− and I−/IO3− reagents. In many cases both reagents afforded products selectively in high yields. The highest halogen atom efficiencies attained were 97% and 93% for Br−/BrO3− and I−/IO3−, respectively. Of the two reagents, I−/IO3− was established to be the preferred reagent for vicinal functionalization of linear alkenes and
ABSTRACT A simple, efficient, and environmentally benign protocol for the synthesis of vicinal iodohydrins and iodoesters from olefins using NH4I and Oxone in CH3CN/H2O (1:1) and dimethylformamide (DMF) / dimethylacetamide (DMA), respectively, without employing a catalyst at room temperature is described. Regio- and stereoselective iodohydroxylation and iodoesterification of various olefins with anti fashion
Abstract A direct synthesis of β-keto sulfones from alkenes is described. A combination of o-iodoxybenzoic acid/iodine (IBX/I2) was found to mediate the reactions of alkenes with arenesulfinates to yield β-keto sulfones in good yields via a one-pot reaction. A direct synthesis of β-keto sulfones from alkenes is described. A combination of o-iodoxybenzoic acid/iodine (IBX/I2) was found to mediate the
摘要 描述了从烯烃直接合成β-酮砜。发现邻碘氧苯甲酸/碘(IBX / I 2)的组合介导烯烃与芳烃亚磺酸盐的反应,通过一锅法反应以良好的产率产生β-酮砜。 描述了从烯烃直接合成β-酮砜。发现邻碘氧苯甲酸/碘(IBX / I 2)的组合介导烯烃与芳烃亚磺酸盐的反应,通过一锅法反应以良好的产率产生β-酮砜。