Synthesis of Pyridobenzazepines Using a One-Pot Rh/Pd-Catalyzed Process
摘要:
In recent years, our group has been developing Multicatalytic reactions for the synthesis of biologically relevant heterocyclic compounds. An efficient dual-metal catalyzed reaction of electron-deficient o-chlorovinylpyridines with o-aminophenylboronic esters to access pyridobenzazepines is described. Combining a Rh-I-catalyzed arylation followed by a Pd-catalyzed C-N coupling, in a one-pot procedure, provides a simplified method to access heterocycles without workup and purification after each step. The substrate scope encompasses a variety of N-H and N-alkylated pyridobenzazepine variants with yields up to 93%.
Rhodium-Catalyzed Domino Conjugate Addition−Cyclization Reactions for the Synthesis of a Variety of <i>N</i>- and <i>O</i>-Heterocycles: Arylboroxines as Effective Carbon Nucleophiles
作者:Ja Ock Park、So Won Youn
DOI:10.1021/ol100610v
日期:2010.5.21
Facile and efficient Rh(I)-catalyzed domino conjugate addition-cyclization reactions of olefins bearing two electrophilic sites and a pendant nucleophile with organoboroxines have been developed to afford a variety of N- and O-heterocycles, such as 3,4-dihydroquinolin-2(1H)-ones, 3,4-dihydrocoumarins, and pyrrolidin-2-ones, which constitute important motifs in biologically active natural and synthetic organic compounds.
Pd-Catalyzed Assembly of Spirooxindole Natural Products: A Short Synthesis of Horsfiline
作者:Nina Deppermann、Heike Thomanek、Alexander H. G. P. Prenzel、Wolfgang Maison
DOI:10.1021/jo101401z
日期:2010.9.3
The Pd-catalyzed intramolecular alpha-arylation of amides is applied to the synthesis of functionalized spirooxindoles. The substrate scope is evaluated, and the reaction is demonstrated to be useful for the assembly of spirooxindole natural products and derivatives thereof. As an application, a new synthesis of horsfiline 1 is presented, giving the natural product in only 4 steps from commercially available amino acid 12.