Oxidant controlled regio- and stereodivergent azidohydroxylation of alkenes via I<sub>2</sub> catalysis
作者:P. K. Prasad、R. N. Reddi、A. Sudalai
DOI:10.1039/c5cc02374b
日期:——
A novel, I2 catalyzed regio- and stereodivergent vicinal azidohydroxylation of alkenes leading to 1,2-azidoalcohols in high yields (up to 92%) and excellent dr (up to 98%) has been developed.
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
<i>N</i>-Iodosuccinimide: A Highly Effective Regioselective Reagent for Iodoesterification of Alkenes
作者:Aleti R. Reddy、Payare L. Sangwan、Praveen K. Chinthakindi、Saleem Farooq、Vidavalur Siddaiah、Surrinder Koul
DOI:10.1002/hlca.201200383
日期:2013.7
efficient method has been achieved for regioselective iodoesterification of alkenes with aliphatic and aromatic acids, and protected amino acids in the presence of N‐iodosuccinimide (NIS) in nearly quantitative yields. Optically enriched iodohydrins have been achieved by LiAlH4 (LAH) reduction of diastereoisomeric iodo esters.
with regioselectivity and stereoselectivity by using ZnAl-BrO3 – layered double hydroxides (LDHs) and KX (X = Br, I) in the presence of formic acid (HCOOH). The protocol exploits the versatile function of formic acid as solvent, nucleophilic reagent, and acidic medium simultaneously, simplifying the reaction and separation of the products.