A new convenient metal-free oxidation protocol of a wide variety of alkenes with molecularoxygen and benzaldehyde under visible lightirradiation of fluorescent lamp afforded their corresponding epoxides in 49―99% yields.
Highly pH-Dependent Chemoselective Transfer Hydrogenation of α,β-Unsaturated Aldehydes in Water
作者:Nianhua Luo、Jianhua Liao、Lu Ouyang、Huiling Wen、Jitian Liu、Weiping Tang、Renshi Luo
DOI:10.1021/acs.organomet.9b00353
日期:2019.8.12
electron-poor substituents on the aryl group of α,β-unsaturated aldehydes can be tolerated, affording the corresponding products in excellent yields with high TOF values. High selectivity and yields were also observed for α,β-unsaturated aldehydes with aliphatic substituents. Our mechanistic investigations indicate that the pH value is critical to the chemoselectivity.
Synthesis of N-heterocycles, beta-amino acids, and allyl amines via aza-payne mediated reaction of ylides and hydroxy aziridines
申请人:Borhan Babak
公开号:US20090012120A1
公开(公告)日:2009-01-08
An ylide-based aza-Payne rearrangement of 2,3-aziridin-
1
-ols leads to an efficient process for the preparation of pyrrolidines. The aza-Payne rearrangement under the basic reaction conditions favors the formation of epoxy amines. Subsequent nucleophilic attack of the epoxide by the ylide yields a bis-anion, which upon a 5-exo-tet ring closure yields the desired pyrrolidine, thus completing the relay of the 3-membered the 5-membered nitrogen containing ring system. This process takes place with complete transfer of stereochemical fidelity, and can be applied to sterically hindered aziridinols.
Enantioselective, Iridium-Catalyzed Monoallylation of Ammonia
作者:Mark J. Pouy、Levi M. Stanley、John F. Hartwig
DOI:10.1021/ja905059r
日期:2009.8.19
activation and that is stable toward a large excess of ammonia. This selective formation of primaryallylicamines allows for one-pot syntheses of heterodiallylamines and allylic amides that are not otherwise accessible via iridium-catalyzedallylic amination without the use of blocking groups and protective group manipulations.
공기 중에서 실온에서 헤테로 지지 루테니움 촉매로 알콜을 알데히드와 케톤으로 선택적으로 산화시키는 방법과 그 촉매
申请人:Jung Won Kim 김정원(420140397117)
公开号:KR20160009439A
公开(公告)日:2016-01-26
본 발명은 실험실에서 뿐만 아니라 화학산업에 사용되는 유기합성 공정 중에서 알테히드와 케톤을 생산하기 위하여 알콜을 헤테로 촉매를 사용하여 선택적으로 산화하는 방법과 그 촉매시스템에 관한 것으로 상기 촉매시스템을 이용하여 알콜과 케톤을 생산함으로써 의약품, 향기, 향수 및 정밀화학 제품의 합성에 중간체로서 이용할 뿐만 아니라, 공기중의 실온에서 헤테로 촉매를 사용할 수 있는 뛰어난 효과가 있다.