1,3-Dipolar Cycloaddition Reactions of Vinylidenecyclopropane-Diesters with Aromatic Diazomethanes Generated in Situ
作者:Lei Wu、Min Shi
DOI:10.1021/jo100105k
日期:2010.4.2
1,3-Dipolarcycloaddition reactions of VDCP-diesters with aromatic diazomethanes generated in situ from the corresponding aromatic aldehydes and tosylhydrazine mediated by base produce pyrazole derivatives in good yields under mild conditions. A plausible reaction mechanism has been proposed on the basis of control experiments along with the discussion on the regioselectivity.
Yb(OTf)<sub>3</sub>-Catalyzed Construction of Indole Derivatives through Formal [3+3] Cycloaddition of 1,1-Vinylidenecyclopropanediesters with Nitrones
作者:Lei Wu、Dr Min Shi
DOI:10.1002/chem.200902510
日期:2010.1.25
Indulging in indoles: Indolederivatives are efficiently afforded throughYb(OTf)3‐catalyzed formal [3+3] cycloaddition of 1,1‐vinylidenecyclopropanediesters with nitrones in moderate to good yields under mild reaction conditions (see scheme).