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 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.
The Rh(III)-catalyzed amidation of C(sp2)-H bonds has been reported by employing the N-methoxyamide as a novel amino source. An excellent level of functional group tolerance can be achieved when N-methoxyamide derivatives are used as the amidating reagents. Importantly, several known bioactive compounds such as Aminalon, Pregabalin, Gabapentin, and Probenecid can be transformed to effective amidating
Cascade C–H Annulation of Aldoximes with Alkynes Using O<sub>2</sub> as the Sole Oxidant: One-Pot Access to Multisubstituted Protoberberine Skeletons
作者:Junbin Tang、Shiqing Li、Zheng Liu、Yinsong Zhao、Zhijie She、Vilas D. Kadam、Ge Gao、Jingbo Lan、Jingsong You
DOI:10.1021/acs.orglett.6b03772
日期:2017.2.3
also achieved under slightly modified conditions. This protocol provides an efficient one-pot access to multisubstituted dehydroberberinium skeletons from simple starting materials, which can be easily transformed into berberinium and tetrahydroberberine skeletons by controlled hydrogenation.
在存在氧的Zn(OTf)2存在下,通过使用简单的[Cp * Rh(OAc)2 ] 2催化体系,开发了醛肟与炔烃的级联双CH环化反应以生产苯并[ a ] ac啶鎓盐。唯一的氧化剂。此外,在稍加修饰的条件下,醛基肟与炔烃,特别是芳基炔烃的CH环化反应也难以合成1 H-异喹啉。该协议提供了从简单的起始原料到多取代脱氢小in碱骨架的有效一锅通行方式,可以通过控制加氢将其轻松转化为小ber碱和四氢小ber碱骨架。