A facile and effective synthesis of 2-azetidinones via phosphonitrilic chloride
作者:Maaroof Zarei
DOI:10.1016/j.tet.2013.05.121
日期:2013.8
The Staudinger reaction of imines to β-lactams was successfully achieved with substituted acetic acid and phosphonitrilicchloride in one-pot under mild conditions. Several types of β-lactams, especially 3-electron-withdrawing group β-lactams, can be synthesized by this versatile and efficient method in good to excellent yields. This method is simple, clean, and the by-products were removed by simple
β-Lactam Preparation via Staudinger Reaction with Activated Dimethylsulfoxide
作者:Maaroof Zarei
DOI:10.1002/jhet.2685
日期:2017.3
efficient synthesis of β‐lactams has been expediently accomplished. These β‐lactams were synthesized by the Staudinger reaction of several substituted imines with various carboxylic acids using activated DMSO at ambient temperature. The imines and substituted acetic acids contain alkyl, aryl, hetero aryl, polycyclic, and 3‐electron‐withdrawing group underwent [2 + 2] ketene‐imine cycloaddition reaction
A straightforward approach to 2-azetidinones from imines and carboxylic acids using dimethyl sulfoxide and acetic anhydride
作者:Maaroof Zarei
DOI:10.1016/j.tetlet.2014.07.089
日期:2014.9
The direct synthesis of 2-azetidinones from imines and carboxylic acids under mild conditions is developed. Dimethylsulfoxide (DMSO) can be activated by aceticanhydride and the resulting active species is used for the in situ generation of ketenes from carboxylic acids. This method is cheap, simple, convenient, and efficient and the products are easily isolated.
Access to Amide from Aldimine via Aerobic Oxidative Carbene Catalysis and LiCl as Cooperative Lewis Acid
作者:Guanjie Wang、Zhenqian Fu、Wei Huang
DOI:10.1021/acs.orglett.7b01195
日期:2017.7.7
Herein, an efficient route to amides from aldimines via aza-Breslow intermediates through aerobic oxidative carbenecatalysis with LiCl as a cooperative Lewis acid is described. Many of the obtained N-heteroarylamides feature biological activity. Ambient air was used as the sole oxidant and source of oxygen in this catalytically oxidative amidation. This method allows for a broad substrate scope and
Organocatalytic asymmetric [4+2] cyclization of 2-benzothiazolimines with azlactones: access to chiral benzothiazolopyrimidine derivatives
作者:Qijian Ni、Xuyang Wang、Fangfang Xu、Xiaoyun Chen、Xiaoxiao Song
DOI:10.1039/d0cc00736f
日期:——
An organocatalytic asymmetricdomino Mannich/cyclization reaction between 2-benzothiazolimines with azlactones has been successfully developed. With the bifunctional squaramide catalyst, this formal [4+2] cyclization occurs with good to high yields and excellent stereoselectivities (up to 99% ee, >20 : 1 dr), providing an efficient and mild access to chiral benzothiazolopyrimidines bearing adjacent