Selectiveortho-Bromination of Substituted Benzaldoximes Using Pd-Catalyzed C–H Activation: Application to the Synthesis of Substituted 2-Bromobenzaldehydes
摘要:
Substituted 2-bromobenzaldehydes were synthesized from benzaldehydes using a three-step sequence involving a selective palladium-catalyzed ortho-bromination as the key step. O-Methyloxime serves as a directing group in this reaction. A rapid deprotection of substituted 2-bromobenzaldoximes afforded substituted 2-bromobenzaldehydes with good overall yields.
Combining Transition Metal Catalysis with Radical Chemistry: Dramatic Acceleration of Palladium-Catalyzed CH Arylation with Diaryliodonium Salts
作者:Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1002/adsc.201200738
日期:2012.12.14
This paper describes a photoredox palladium/iridium-catalyzed C-H arylation with diaryliodonium reagents. Details of the reaction optimization, substrate scope, and mechanism are presented along with a comparison to a related method in which aryldiazonium salts are used in place of diaryliodonium reagents. The unprecedentedly mild reaction conditions (25 masculineC in methanol), the requirement for
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。
1-아미노인단 및 이의 제조방법
申请人:Research & Business Foundation SUNGKYUNKWAN UNIVERSITY 성균관대학교산학협력단(220050013604) BRN ▼101-82-12009
公开号:KR20190083486A
公开(公告)日:2019-07-12
본 발명은 신규 1-아미노인단 및 이의 제조방법에 관한 것으로, 보다 구체적으로는 로듐 (Ⅲ) 촉매를 이용한 C-H 활성화 (C-H Activation) 반응 결과로 생성된 1-아미노인단 및 이의 제조방법에 대한 것이다. 본 발명의 로듐 (Ⅲ) 촉매를 이용한 1-아미노인단 제조 방법은 기존의 1-아미노인단의 합성이 다단계로 이루어졌던 것을 개선하여 단일 단계 반응으로 합성되는 장점이 있고, 선택적인 입체이성질체의 수득이 가능할 뿐만 아니라, 단일부분입체이성질체의 수득이 가능하며, 또한 수득율이 현저히 향상(80-90%)되는 장점을 가지고 있으며, 다양한 치환체의 합성을 가능하게 할 수 있다.
ortho-Olefination of Arylaldehyde O-Methyloximes through Palladium-Catalyzed C-H Activation
作者:Zhipeng Xu、Biao Xiang、Peipei Sun
DOI:10.1002/ejoc.201200393
日期:2012.6
Palladium(II)-catalyzed ortho-olefination of arylaldehydeO-methyloximes by using O-methyloxime as a directing group gave 2-alkenylarylaldehyde O-methyloximes in moderate to good yields. After various reaction parameters (catalyst, oxidant, solvent, and reaction temperature) were examined, the optimal conditions for the reaction were identified. 2-Alkenylarylaldehydes could be obtained conveniently
通过使用 O-甲基肟作为导向基团,钯 (II) 催化芳基醛 O-甲基肟的邻-烯烃化反应以中等至良好的产率得到 2-烯基芳基醛 O-甲基肟。在检查了各种反应参数(催化剂、氧化剂、溶剂和反应温度)后,确定了反应的最佳条件。2-烯基芳醛可以通过偶联产物的水解方便地获得。提供了 C-H 键活化的动力学同位素效应 (kH/kD),并提出了反应的可能机制。
Synthesis of 2-aryl quinazolines from (2-aminophenyl)methanol and oxime ether catalyzed by copper ferrite nanoparticles
作者:Sachin A. Sarode、Vilas G. Jadhav、Jayashree M. Nagarkar
DOI:10.1016/j.tetlet.2017.01.037
日期:2017.2
Magnetically separable copper ferrite nps as a catalytic system, under solvent free reaction condition for synthesis of 2-arylquinazolines has been reported. (2-aminoaryl)methanols and various types of oximeethers were efficiently converted into desired products in moderate to good yields. This protocol offers a greener and atom efficient process, using recyclable heterogeneous catalytic system.