Doubly Coarctate-Stabilized Carbenes: Synthetic and Computational Studies
摘要:
Isoindazoles joined by an ethynyl linker to either a phenyltriazene or a phenyldiazene moiety were synthesized, and their subsequent reactivity was examined. Computations suggest that these molecules could rearrange at moderate temperatures via carbene intermediates that are doubly stabilized by coarctate conjugation. The experimental results corroborate the calculations, as the transient carbene can either be trapped with oxygen or undergo ring opening to afford a rearranged product Additional calculations illustrate some design principles that might lead to stable carbenes that are the global minimum on the coarctate hypersurface.
Cu/Pd cooperatively catalyzed tandem C–N and C–P bond formation: access to phosphorated 2H-indazoles
作者:Weiwei Wei、Xuanyi Li、Meng Gu、Hequan Yao、Aijun Lin
DOI:10.1039/c7ob02323e
日期:——
A novel Cu/Pd cooperatively catalyzed tandem C-N and C-P bondsformationreactionbetween 2-alkynyl azobenzenes and P(O)H compounds has been developed. This reaction provides a convenient approach to the synthesis of various phosphorated 2H-indazoles in moderate to good yields, exhibiting good functional group tolerance and high atom economy.