A convenient procedure was developed for the synthesis of vicinal iodoperoxyalkanes by the reaction of alkenes with iodine and hydroperoxides. The best results were achieved with the use of excess iodine. The replacement of one iodine atom by hydroperoxides in vicinal diiodoalkanes was discovered. A suggestion was made about the reaction mechanism.
Reaction of Alkenes with Hydrogen Peroxide and Sodium Iodide: A Nonenzymatic Biogenic-Like Approach to Iodohydrins
作者:José Barluenga、María Marco-Arias、Francisco González-Bobes、Alfredo Ballesteros、José M. González
DOI:10.1002/chem.200305582
日期:2004.4.2
An efficient protocol to synthesize iodohydrins from alkenes is presented. Reactions were conducted in aqueous media using safe and readily available sodiumiodide (the most abundant form of the element), and a highly convenient oxidant such as hydrogen peroxide. Addition of a protic acid triggers a faster and efficient process, a role formally related to that played by haloperoxidase enzymes in naturally
The reaction of cycloalkene with
iodineâcerium(IV) ammonium nitrate (CAN) in
acetonitrileâwater (10:1â1:1) affords the
corresponding trans-iodohydrins and
trans-iodonitrates; when
iodineâcerium(IV) sulfate (CS) in
acetonitrileâwater (10:1) at 50 °C is used,
trans-iodohydrins are obtained preferentially.
Convenient, in Situ Generation of Anhydrous Hydrogen Iodide for the Preparation of α-Glycosyl Iodides and Vicinal Iodohydrins and for the Catalysis of Ferrier Glycosylation
作者:Stephanie M. Chervin、Paolo Abada、Masato Koreeda
DOI:10.1021/ol991312d
日期:2000.2.1
[reaction: see text] Anhydrous hydrogen iodide is generated in situ by the reaction of solid iodine and a thiol. The HI thus generated has been employed for the efficient preparation of alpha-glycosyl iodides and vicinal iodohydrins from the corresponding glycosyl acetates and epoxides, respectively, and for Ferrier glycosylation of alcohols and thiols.
Enzymatic preparation of (1S,2R)- and (1R,2S)-stereoisomers of 2-halocycloalkanols
作者:Olga O. Kolodiazhna、Anastasy O. Kolodiazhna、Oleg I. Kolodiazhnyi
DOI:10.1016/j.tetasy.2012.11.011
日期:2013.1
The stereoisomers of cis-2-halocycloalkanols were resolved by a kinetically controlled transesterification with vinyl acetate in the presence of lipases in organic media. High enantioselectivities (ee >98%) and good isolated yields were obtained for all substrates using the appropriate lipase. Burkholderia cepacia lipase was the most efficient enzyme for the resolution of these substrates. The enantiomeric purities of the compounds were defined by derivatization with Mosher's acid and the absolute configurations were determined by chemical correlation. (C) 2012 Elsevier Ltd. All rights reserved.