The use of BrCCl3-PPh3 in Appel type transformations to esters, O-acyloximes, amides, and acid anhydrides
作者:Mariam Al-Azani、Mazen al-Sulaibi、Nuha al Soom、Yosef Al Jasem、Bernhard Bugenhagen、Bassam Al Hindawi、Thies Thiemann
DOI:10.1016/j.crci.2016.04.004
日期:2016.8
Abstract Esters, acyloximes, amides and acid anhydrides have been prepared from the respective carboxylic acids, oximes, amines and alcohols by the use of the reagent combination BrCCl3-PPh3. The reactions obviate the handling acyl halides or more aggressive reagents PCl3, POCl3, or SOCl2. Furthermore, the environmentally hazardous CCl4 used in Appel-type reactions is replaced with BrCCl3, a reagent
Copper-Catalyzed Annulation of Oxime Acetates with α-Amino Acid Ester Derivatives: Synthesis of 3-Sulfonamido/Imino 4-Pyrrolin-2-ones
作者:Chun-Bao Miao、An-Qi Zheng、Li-Jin Zhou、Xinyu Lyu、Hai-Tao Yang
DOI:10.1021/acs.orglett.0c00870
日期:2020.5.1
A copper-catalyzed annulation of oxime acetates and α-amino acidesterderivatives for the easy preparation of 4-pyrrolin-2-ones bearing a 3-amino group has been developed. This process features the oxidation of amines with oxime esters as the internal oxidant to produce the active 1,3-dinucleophilic and 1,2-dielectrophilic species concurrently. The subsequent nucleophilic cyclization realizes the
Ph<sub>3</sub>P/I<sub>2</sub>-Catalyzed Beckmann Rearrangement of Ketoximes into Amides
作者:Feng Xu、Ni-Ge Wang、You-Ping Tian、Yong-Mei Chen、Wei-Chun Liu
DOI:10.1080/00397911.2011.585270
日期:2012.12.1
Abstract A Beckmannrearrangement of ketoximes reaction using triphenylphosphine/iodine as an effective catalyst in acetonitrile at reflux temperature is reported. The results indicate that conversion of oximes to amides can be reached in good to excellent yields under optimal reaction conditions within several minutes. The reaction mechanism is also proposed. Supplemental materials are available for