Lewis Base Catalyzed, Enantioselective, Intramolecular Sulfenoamination of Olefins
摘要:
A method for the enantioselective, intramolecular sulfenoamination of various olefins has been developed using a chiral BINAM-based selenophosphoramide, Lewis base catalyst. Terminal and trans disubstituted alkenes afforded pyrrolidines, piperidines, and azepanes in high yields and high enantiomeric ratios via enantioselective formation and subsequent stereospecific capture of the thiiranium intermediate with the pendant tosyl-protected amine.
DIRECT ANTI-MARKOVNIKOV ADDITION OF ACIDS TO ALKENES
申请人:THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL
公开号:US20160096791A1
公开(公告)日:2016-04-07
A method of making an anti-Markovnikov addition product, comprises reacting an acid with an alkene or alkyne in a dual catalyst reaction system to the exclusion of oxygen to produce said anti-Markovnikov addition product; the dual catalyst reaction system comprising a single electron oxidation catalyst in combination with a hydrogen atom donor catalyst. Dual catalyst composition useful for carrying out such methods are also described.
Direct anti-markovnikov addition of acids to alkenes
申请人:The University of North Carolina at Chapel Hill
公开号:US10017441B2
公开(公告)日:2018-07-10
A method of making an anti-Markovnikov addition product, comprises reacting an acid with an alkene or alkyne in a dual catalyst reaction system to the exclusion of oxygen to produce said anti-Markovnikov addition product; the dual catalyst reaction system comprising a single electron oxidation catalyst in combination with a hydrogen atom donor catalyst. Dual catalyst composition useful for carrying out such methods are also described.
Formate-Mediated Reductive Cross-Coupling of Vinyl Halides and Aryl Iodides: cine-Substitution via Palladium(I) Catalysis
作者:Catherine G. Santana、Yhin Sarah Teoh、Madeline M. Evarts、Jonathan Z. Shezaf、Michael J. Krische
DOI:10.1021/acs.orglett.4c02642
日期:2024.8.23
Formate-mediated reductive cross-couplings of vinylhalides with aryl iodides via palladium(I) catalysis occur with highly uncommon cine-substitution. The active dianionic palladium(I) catalyst, [Pd2I4][NBu4]2, is generated in situ from Pd(OAc)2, Bu4NI, and formate. Oxidative addition of aryl iodide followed by dissociation of the dimer provides the monomeric anionic T-shaped arylpalladium(II) species
甲酸盐介导的乙烯基卤化物与芳基碘化物通过钯 (I) 催化的还原叉偶联以非常罕见的 cine 取代发生。活性二离子钯 (I) 催化剂 [Pd2I4][NBu4]2 由 Pd(OAc)2、Bu4NI 和甲酸盐原位生成。芳基碘化物的氧化加成,然后二聚体解离,产生了单体阴离子 T 形芳钞 (II) 物种 [Pd(Ar)(I)2(NBu4)],它在乙烯基卤化物碳钯化后通过钯 (IV) 卡宾形成电影取代产物,氘标记实验证实了这一点。
Anti-Markovnikov Hydroamination of Alkenes Catalyzed by an Organic Photoredox System
作者:Tien M. Nguyen、David A. Nicewicz
DOI:10.1021/ja4031616
日期:2013.7.3
Herein we report a metal-free method for the direct anti-Markovnikov hydroamination of unsaturated amines. Irradiation of the amine substrates with visible light in the presence of catalytic quantities of easily synthesized 9-mesityl-10-methylacridinium tetrafluoroborate and thiophenol as a hydrogen-atom donor furnished the nitrogen-containing heterocycles with complete regiocontrol. Two examples of intermolecular anti-Markovnikov alkene hydroamination are also disclosed.