Lewis acid-promoted electron transfer deoxygenation of epoxides, sulfoxides, and amine N-oxides: the role of low-valent niobium complexes from NbCl5 and Zn
作者:Kyungsoo Oh、William Eric Knabe
DOI:10.1016/j.tet.2009.02.013
日期:2009.4
A mild and operationally simple deoxygenation of epoxides, sulfoxides, and amine N-oxides is described using a sub-stoichiometric amount of low-valent niobium complexes generated in situ from commercially available NbCl5 and zinc dust. The deoxygenation proceeds by a reductive cleavage of polarized O–C/O–N/O–S bonds through a single electron transfer from zinc metal to the niobium–substrate complex
Catalysis of Phosphorus(V)-Mediated Transformations: Dichlorination Reactions of Epoxides Under Appel Conditions
作者:Ross M. Denton、Xiaoping Tang、Adam Przeslak
DOI:10.1021/ol102010h
日期:2010.10.15
A stereospecific triphenylphosphine oxide-catalyzed 1,2-dichlorination reaction of epoxides has been developed. The reaction is effective for a range of terminal and internal epoxides. In contrast to the classical Appel-type dichlorination of epoxides, oxalyl chloride is used as a stoichiometric reagent to generate the chlorophosphonium salt responsible for dichlorination from catalytic triphenylphosphine
Regioselective Conversion of Unsymmetrical Terminal Epoxides into Vicinal Chlorohydrins Using Dimethoxyboron Chloride
作者:Chandra D. Roy
DOI:10.1071/ch06315
日期:——
synthesis of chlorohydrins by chlorinative cleavage of unsymmetrical epoxides utilizing dimethoxyboron chloride is described. Except for styrene oxide, all the terminal epoxides were regioselectively cleaved following a predominantly SN2-type reaction pathway favouring the formation of primary chlorides. In the case of styrene oxide, a benzylic epoxide, (MeO)2BCl transfers the chlorine at the benzylic
The generation and trapping of enantiopure bromonium ions
作者:D. Christopher Braddock、Stephen A. Hermitage、Lilian Kwok、Rebecca Pouwer、Joanna M. Redmond、Andrew J. P. White
DOI:10.1039/b816914d
日期:——
Enantiopure bromoniumions may be generated from enantiopure bromohydrins and derivatives, they can be trapped with an in situ nucleophile to give enantiomerically pure products.
Synthesis of Isotopically Labelled Disparlure Enantiomers and Application to the Study of Enantiomer Discrimination in Gypsy Moth Pheromone-Binding Proteins
作者:Govardhana R. Pinnelli、Mailyn Terrado、N. Kirk Hillier、David R. Lance、Erika Plettner
DOI:10.1002/ejoc.201901164
日期:2019.10.31
8S)‐epoxy‐2‐methyloxtadecane, is the sex pheromone of the gypsymoth. Its shortest synthesis, in high (> 99 %) enantiomeric excess is reported. Furthermore, the incorporation of stable isotope labels into disparlure and studies by 2H NMR of the interaction between disparlure enantiomers and the two pheromone‐binding proteins found in the antennae of male gypsymoths in described.
Disparlure(7R,8S)-环氧-2-甲基氧十二烷是吉普赛蛾的性信息素。据报道其最短的合成,对映体过量很高(> 99%)。此外,描述了将稳定的同位素标记掺入disparlure中,并通过2 H NMR研究了在男性吉普赛蛾的触角中发现的disparlure对映异构体与两种信息素结合蛋白之间的相互作用。