Access to Isoquinolines and Isoquinolin-3-ols via Rh(III)-Catalyzed Coupling/Cyclization Cascade Reaction of Arylimidates and Diazo Compounds
作者:Xing Guang Li、Min Sun、Qiao Jin、Kai Liu、Pei Nian Liu
DOI:10.1021/acs.joc.6b00264
日期:2016.5.6
A Rh(III)-catalyzed coupling/cyclization cascade reaction is described, which involves arylimidates and diazocompounds and proceeds via intermolecular C–C bond formation and subsequent intramolecular C–N bond formation. Mechanistic investigation revealed that the reaction is a two-step process: the initial Rh(III)-catalyzed coupling/cyclization proceeds very fast and the following dehydration is rather
Steric control based on alkyl substituents in the [2,3]sigmatropic rearrangement of nine-membered allylsulfonium ylides. A new entry to the stereoselective synthesis of elemane-type sesquiterpenoids
作者:Fusao Kido、Kazuo Yamaji、Subhash C. Sinha、Akira Yoshikoshi、Michiharu Kato
DOI:10.1039/c39940000789
日期:——
The rhodium(II)-catalysed cyclisation of acyclic α-diazomalonate 1b and α-diazo-β-keto esters 1c, d give stereoselectively the highly substituted δ-lactone 3b and cyclohexanones 3c, d, respectively, by [2,3]sigmatropic rearrangement via the stereocontrolled nine-membered allylsulfonium ylides 2b–d.
Synthesis of 9,
<scp>10‐Phenanthrenes</scp>
via Rh(
<scp>III</scp>
)‐Catalyzed [4+2] Annulation of
<scp>2‐Biphenylboronic</scp>
Acids with Diazo Compounds
A Rh(III)-catalyzed, transmetalation triggered C—Hactivation/annulation of 2-biphenylboronic acids with diazo compounds from β-keto esters or 1,3-dicarboxylates has been developed, leading to the synthesis of two kinds of 9,10-phenanthrenes. Notably, a rhodacyle was synthesized by treating the rhodium catalyst with stoichiometric amounts of 2-biphenylboronic acids and pyridine, which was further verified