Reaction of aldehyde O-alkyl oxime with organometallic compounds
作者:Shinichi Itsuno、Koji Miyazaki、Koichi Ito
DOI:10.1016/s0040-4039(00)84709-7
日期:1986.1
Aldehyde O-alkyl oximes were converted into ketones with high yields when they were treated with alkyllithium compounds or Grignard reagents followed by hydrolysis. Amines as reductive alkylation products of aldehyde O-alkyl oximes were also obtained by BH3 reduction before hydrolysis.
O-Methyl oximes have been employed as nucleophiles in reactions with ketenimines derived from sulfonylazides and terminal alkynes to form N-alkylidene N′-tosylacetimidamide derivatives. The optimized conditions involved the use of CuPF6 and i-Pr2NEt in MeCN at 65 °C. Both O-methyl aldoximes and ketoximes were tolerated under the optimum conditions.
Tandem Nucleophilic Addition/Oxy-2-azonia-Cope Rearrangement for the Formation of Homoallylic Amides and Lactams: Total Synthesis and Structural Verification of Motuporamine G
作者:Lijun Zhou、Zhiming Li、Yue Zou、Quanrui Wang、Italo A. Sanhueza、Franziska Schoenebeck、Andreas Goeke
DOI:10.1021/ja310002m
日期:2012.12.12
oxy-2-azonia-Cope rearrangements give homoallylic amides. In the case of 2-vinylcycloalkanones, the process results in ring enlargement, providing a novel route to 9- to 16-membered lactams. The preparative significance of this protocol was evidenced by a short synthesis of macrocyclic alkaloid motuporamine G. The stereochemistry-defining step of this oxy-azonia-Cope rearrangement was further studied
Nickel-catalyzed transformation of alkene-tethered oxime ethers to nitriles using a traceless directing group strategy has been developed. A series of alkene-tethered oxime ethers derived from benzaldehyde and cinnamyl aldehyde derivatives were converted into the corresponding benzonitriles and cinnamonitriles in 46-98% yields using the nickel catalyst system. Control experiments showed that the alkene
Tandem Oxidation Processes: The Direct Conversion of Activated Alcohols into Oximes; Synthesis of Citaldoxime
作者:Richard J. Taylor、Hisashi Kanno
DOI:10.1055/s-2002-32949
日期:——
The direct conversion of primary alcohols into oximes is reported using manganese dioxide and alkoxylamines/hydroxylamine as their hydrochloride salts or supported on Amberlyst 15. This transformation has been applied to a range of benzylic, allylic and propargylic alcohols and utilised to prepare the natural product citaldoxime.