Efficient Access to Cyclic Ureas via Pd-Catalyzed Cyclization
摘要:
An efficient regioselective method for the preparation of structurally diverse imidazopyridinones and benzoimidazolones starting from readily available and economical starting materials is described. High-yielding reductive alkylation of electron-deficient o-haloarylamines followed by treatment with inexpensive N-chlorosulfonyl isocyanate afforded primary ureas in good overall yields. A Pd-catalyzed urea cyclization reaction furnished imidazopyridinones and benzoimidazolones in excellent yields. Overall, the developed chemistry provides rapid access to pharmaceutically important heterocyclic compounds with high efficiency.
Radical Cation Salt-initiated Aerobic C−H Phosphorylation of <i>N</i>
-Benzylanilines: Synthesis of α-Aminophosphonates
作者:Xiaodong Jia、Xiaofei Liu、Yu Yuan、Pengfei Li、Wentao Hou、Kaixuan He
DOI:10.1002/asia.201800584
日期:2018.8.6
A radicalcationsalt‐initiated phosphorylation of N‐benzylanilines was realized through an aerobic oxidation of the sp3 C−H bond, providing a series of α‐aminophosphonates in high yields. An investigation of the reaction scope revealed that this mild catalyst system is superior in good functional group tolerance and high reaction efficiency. The mechanistic study implied that the cleavage of the sp3