35307-22-3Relevant academic research and scientific papers
Development of a generic activation mode: Nucleophilic α-substitution of ketones via oxy-allyl cations
Vander Wal, Mark N.,Dilger, Andrew K.,Macmillan, David W. C.
, p. 3075 - 3079 (2013/07/26)
Oxy-allyl cations have been known as transient electrophilic species since they were first proposed as intermediates in the Favorskii rearrangement in 1894. Since that time, they also have been used as a mode of activation for [4 + 3] cycloadditions in a variety of natural product syntheses. In this manuscript, we describe a method for the interception of oxy-allyl cations with a diverse range of common nucleophiles, thereby demonstrating the value of this intermediate as a generic mode of activation. This simple, mild, room temperature protocol allows for the formation of a variety of high value carbon-carbon and carbon-heteroatom bonds that are readily incorporated within a series of cyclic and acyclic ketone systems. Initial efforts into the development of an enantioselective catalytic variant are also described.
Ring-opening reactions of epoxides catalyzed by molybdenum(VI) dichloride dioxide
Jeyakumar, Kandasamy,Chand, Dillip Kumar
, p. 807 - 819 (2008/09/21)
Transformation of epoxides to β-alkoxy alcohols, acetonides, and α-alkoxy ketones is achieved by using molybdenum(VI) dichloride dioxide (MoO2Cl2) as a catalyst. Alcohol, aldehyde, oxime, tosyl, and tert-butyldimethylsilyl functional groups are tolerated during the methanolysis and acetonidation of the functionalized epoxides. No polymerization product is observed with any of the epoxides. Direct conversion of epoxides devoid of sensitive functional groups into the corresponding α-methoxy ketone is achieved in a single step by using the MoO2Cl 2/Oxone system. Georg Thieme Verlag Stuttgart.
Diastereo- and enantioselective synthesis of cis-2- hydroxycyclohexanamine and corresponding ethers by asymmetric reductive amination
Lauktien, Gerhard,Volk, Franz-J,Frahm, August W.
, p. 3457 - 3466 (2007/10/03)
A series of homochiral cis-2-alkoxy- and 2-aryloxyeyclohexanamines 5b- 5e has been synthesised by means of asymmetric reductive amination of the corresponding racemic 2-oxygenated cyclohexanones 2 with ee-values ranging from 95 to >99%. The respective 2-hydroxy and 2-cyclohexyl derivatives 5g-5h have been prepared from the 2-phenoxycyclohexanamine 4e. Relative and absolute stereochemistry has been elucidated.
CHEMISTRY OF α-NITROEPOXIDES: SYNTHESIS OF USEFUL INTERMEDIATES VIA NUCLEOPHILIC RING OPENING OF α-NITROEPOXIDES
Vankar, Yashwant D.,Shah, Kavita,Bawa, Anita,Singh, Surendra P.
, p. 8883 - 8906 (2007/10/02)
Various α-nitroepoxides are converted into corresponding 1,2-diketones via two different ways of ring opening viz. with Pd(O) and with DMSO/BF3*EtO2 (or ClSiMe3).In addition to this, a variety of nucleophiles are reacted with α-nitrocyclopentene oxide 6 and α-nitrocyclohexene oxide 7 to form the corresponding α-substituted ketones which are useful intermediates in organic synthesis.Two of the products so obtained viz. 32 and 33 are also transformed further into optically active thialactones 38 and 39 respectively via baker's yeast reduction followed by lactonisation.
