N-Phosphinyl Phosphoramide-A Chiral Brønsted Acid Motif for the Direct Asymmetric N,O-Acetalization of Aldehydes
作者:Sreekumar Vellalath、Ilija Čorić、Benjamin List
DOI:10.1002/anie.201005347
日期:2010.12.10
Fine‐tuning the sites: The readily accessible N‐phosphinyl phosphoramide 1 proved to be highly efficient and enantioselective in catalyzing the title reaction. The synthetic utility of this methodology was demonstrated with the first catalytic asymmetric synthesis of the analgesic pharmaceutical (R)‐chlorothenoxazine (see scheme).
The Condensation of Salicylamide with Aldehydes and Ketones
作者:Bruce W. Horrom、Harold E. Zaugg
DOI:10.1021/ja01158a019
日期:1950.2
Intramolecular functionalization of C(sp 3 ) H bonds adjacent to an amide nitrogen atom: Metal-free synthesis of 2-hydroxy-benzoxazinone derivatives
作者:Biao Gao、Kaili Chen、Xiaoling Bi、Jinxin Wang
DOI:10.1016/j.tet.2017.09.001
日期:2017.12
An intramolecularC(sp3)H bond functionalization adjacent to an amide nitrogen atom was successfully developed for synthesis of 2-hydroxybenzoxazinone derivatives under environment-friendly conditions. The method featured no metal catalyst, broad substrate scopes and high yields. Besides, a radical mechanism was proposed in the reaction process. Additionally, most of target compounds exhibited potent