Palladium-Catalyzed Reactions of Allenes with 2-Iodobenzenesulfonamides: Simple Synthesis of Benzosultams under Green Conditions
作者:K. Kumara Swamy、M. Nagarjuna Reddy
DOI:10.1055/s-0033-1340821
日期:——
palladium-catalyzed reaction for the synthesis of benzosultams from allenes and 2-iodobenzenesulfonamides in poly(ethylene glycol) medium is described. This route is compared with a second method involving an internal Heck reaction of alkene-functionalized 2-iodobenzenesulfonamides. Key products were characterized by single-crystal X-ray crystallography. A palladium-catalyzed reaction for the synthesis of benzosultams
Gold-catalyzed [2+2+2+2]-annulation of 1,3,5-hexahydro-1,3,5-triazines with alkoxyallenes
作者:Shiyong Peng、Danqing Ji、Jiangtao Sun
DOI:10.1039/c7cc07554e
日期:——
unprecedented gold-catalyzed [2+2+2+2]-annulation of 1,3,5-hexahydro-1,3,5-triazines with alkoxyallenes has been developed, providing eight-membered heterocycles in good to excellent yields. Deuteriumlabeling and control experiments reveal the possible reaction mechanism for this annulation.
Gold(<scp>i</scp>)-catalyzed hydroindolylation of allenyl ethers
作者:Chandrababu Naidu Kona、Mahesh H. Shinde、Chepuri V. Ramana
DOI:10.1039/c5ob00635j
日期:——
The gold(I)-catalyzed reaction/rearrangement of allenyl ethers has been investigated in the presence of indoles. Either hydroindolylation or alkylation of an indole with the pendant group of allenyl ether has been observed. The reaction outcome seems to be decided mainly by the nature of the pendant group of the allenyl ether. Control experiments are indicative of an inner sphere mechanism for the hydroindolylation
A highly enantioselective regiodivergent addition of alkoxyallenes to pyrazolones was developed to afford multiply functionalized alkylated products bearing a quaternary carbon stereocenter in high yields with excellent stereoselectivities. One approach is enabled by palladiumcatalysis, thus leading to branched allylic pyrazol‐5‐ones under mild reaction conditions. The other is catalyzed by a chiral
A Pd-catalyzed linear selective intermolecular asymmetric dearomative allylicalkylation reaction of naphthols with alkoxyallenes under mild reaction conditions is reported. The transformation is successfully promoted by Pd2(dba)3 and the chiral Trost ligand and provides a general atom-efficient protocol to obtain various β-naphthalenones bearing an all carbon quaternary stereogenic center in good