Synthesis of Substituted Pyrazoles via Tandem Cross-Coupling/Electrocyclization of Enol Triflates and Diazoacetates
作者:David J. Babinski、Hector R. Aguilar、Raymond Still、Doug E. Frantz
DOI:10.1021/jo201042c
日期:2011.8.5
The synthesis of 3,4,5-trisubstituted pyrazoles via a tandem catalytic cross-coupling/electrocyclization of enoltriflates and diazoacetates is presented. The initial scope of this methodology is demonstrated on a range of differentially substituted acyclic and cyclic enoltriflates as well as an elaborated set of diazoacetates to provide the corresponding pyrazoles with a high degree of structural
Cycloadditions of Noncomplementary Substituted 1,2,3-Triazines
作者:Erin D. Anderson、Adam S. Duerfeldt、Kaicheng Zhu、Christopher M. Glinkerman、Dale L. Boger
DOI:10.1021/ol502436n
日期:2014.10.3
The scope of the [4 + 2] cycloadditionreactions of substituted 1,2,3-triazines, bearing noncomplementary substitution with electron-withdrawing groups at C4 and/or C6, is described. The studies define key electronic and stericeffects of substituents impacting the reactivity, mode (C4/N1 vs C5/N2), and regioselectivity of the cycloadditionreactions of 1,2,3-triazines with amidines, enamines, and