Acetic Anhydride–Acetic Acid as a New Dehydrating Agent of Aldoximes for the Preparation of Nitriles: Preparation of 2-Cyanoglycals
作者:Henok H. Kinfe、Tommy F. Mabasa、Jackie Mabasa、Mthokozisi Simelane、Banele Vatsha、Banothile C.E. Makhubela
DOI:10.1055/s-0040-1708007
日期:2020.6
Herein, we report a combination of Ac2O and AcOH as new and efficient dehydratingagent of aldoximes for the synthesis of 2-cyanoglycals. In comparison to the conventional dehydrating system of Ac2O-base (such as NaOH, NaOAc and K2CO3), the current protocol provides superior yields and faster reaction rates. The scope and limitations of the dehydrating system are investigated.
The reaction of isocyanates and oximes undergoes N-selective carbamoylation, directly generating nitrones. Sequential reactions with dipolarophiles give isoxazolidines. The combination of the three components provides diversity in the yields of isoxazolidines.