Iron-Catalyzed Annulation of 1,2-Diamines and Diazodicarbonyls for Diverse and Polyfunctionalized Quinoxalines, Pyrazines, and Benzoquinoxalines in Water
作者:Rameshwar Prasad Pandit、Sung Hong Kim、Yong Rok Lee
DOI:10.1002/adsc.201600503
日期:2016.11.17
construction of polyfunctionalized quinoxalines has been developed. The key strategy includes the one‐pot domino N−H insertion, cyclization, and oxidation reactions. This protocol offers a safe and mild synthetic approach to access a variety of quinoxalinederivatives in high yields. This methodology also allows the formation of biologically interesting pyrazines and benzoquinoxalines.
High Stereocontrol in the Preparation of Silyl-Protected γ-Substituted Enoldiazoacetates
作者:Kuiyong Dong、Kostiantyn O. Marichev、Xingfang Xu、Michael P. Doyle
DOI:10.1055/s-0037-1611865
日期:2019.7
A robust and efficient synthesis of triisopropylsilyl (TIPS)-protected γ-substituted enoldiazoacetates with excellent Z stereocontrol by using lithium bis(trimethylsilyl)azanide (LiHMDS) as a base and TIPSOTf as a silyl transfer reagent is reported. Despite their increased size compared to previously tert-butyldimethylsilyl (TBS)-protected γ-unsubstituted enoldiazoacetates, a high product yield with