Direct Titanium-Mediated Conversion of Ketones into Enamides with Ammonia and Acetic Anhydride
作者:Jonathan T. Reeves、Zhulin Tan、Zhengxu S. Han、Guisheng Li、Yongda Zhang、Yibo Xu、Diana C. Reeves、Nina C. Gonnella、Shengli Ma、Heewon Lee、Bruce Z. Lu、Chris H. Senanayake
DOI:10.1002/anie.201107601
日期:2012.2.6
A one‐step conversion of ketones into N‐acetyl enamides was developed. The process employs safe and inexpensive reagents, proceeds under mild conditions, and tolerates diverse functional groups. The addition of edte (N,N,N′,N′‐tetrakis(2‐hydroxyethyl)ethylenediamine) prior to workup enables water solubilization of Ti alkoxides and allows a simple extractive workup.
A copper(II)-catalyzed oxidative reaction for the one-pot simultaneous synthesis of quinolines and gem-diamine derivatives from N-arylglycine ethyl esters and enamides is described. In this reaction, the two fragments in an enamide substrate react with the same intermediate generated in situ from an N-arylglycine ethyl ester, respectively, producing two products simultaneously. This reaction has the
Facile Synthesis of Trisubstituted Carbazoles by Acid‐Catalyzed Ring‐Opening Annulation of 2‐Amidodihydrofurans with Indoles
作者:Jingjing Zhao、Pan Li、Chungu Xia、Fuwei Li
DOI:10.1002/chem.201503260
日期:2015.11.9
A mild and convenient synthesis of carbazoles by TfOTMS (trimethylsilyl trifluoromethanesulfonate)‐catalyzedring‐openingannulation of 2‐amidodihydrofurans is presented with a high degree of chemoselectivity and regioselectivity. This procedure was also scaled up to a gram‐scale synthesis. The reaction could involve an iminonium intermediate through a series of CO, CN bond cleavages, CC bond formations
Alkali-Induced Ring-Opening of 2-Amidodihydrofuran and Manganese-Catalyzed Aerobic Dehydrogenation Annulation: Access to Functionalized Oxazole
作者:Pan Li、Jingjing Zhao、Xinjian Li、Fuwei Li
DOI:10.1021/acs.joc.7b00112
日期:2017.5.5
functionalized oxazoles from 2-amidodihydrofurans has been achieved by alkali-induced intramolecular C–O bondcleavage and formation using air as a green oxidant. Moreover, these functionalized oxazoles could be readily transformed into the corresponding oxazole-substituted pyrazoles and 2H-azirines.
Synthesis of multi-substituted pyrroles using enamides and alkynes catalyzed by Pd(OAc)<sub>2</sub>with molecular oxygen as an oxidant
作者:Yun-He Xu、Tao He、Qiu-Chi Zhang、Teck-Peng Loh
DOI:10.1039/c3cc49683j
日期:——
A cyclization reaction between enamides and alkynes catalyzed by palladium(II) acetate is described. In this method, the molecular oxygen serves as an efficient oxidant for the Pd(II)/Pd(0) catalytic cycle. The simple reaction conditions permit this methodology to be used as a general tool for the preparation of multi-substituted pyrroles.