From Phenols to Azulenes: An Extended and Versatile Route to Polyalkylated Azulenes with Variable Substitution Patterns at the Seven- and Five-membered Ring
Lastereochimie de l'addition depends des facteurs steriques, du solvant, et de la nature des groupes activants。Ainsi les cetones acetyleniques donnent Exclusive les isomeres E (controle thermodynamique) et lesnitiles acetyleniques Fournissent seulement les isomeres Z (controle cinetique)
Asymmetricaddition of arylboroxines to beta-alkoxyacrylate esters proceeded in the presence of a rhodium complex coordinated with a chiral diene ligand to give high yields of beta-alkoxy-beta-arylcarboxylic acid esters with very high enantioselectivity.
Rhodium-Catalyzed Asymmetric Addition of Arylboronic Acids to β-Phthaliminoacrylate Esters toward the Synthesis of β-Amino Acids
作者:Takahiro Nishimura、Jun Wang、Makoto Nagaosa、Kazuhiro Okamoto、Ryo Shintani、Fuk-yee Kwong、Wing-yiu Yu、Albert S. C. Chan、Tamio Hayashi
DOI:10.1021/ja909642h
日期:2010.1.20
Rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to beta-phthaliminoacrylate esters took place efficiently to give high yields of beta-aryl-beta-amino acid esters with 96-99% enantioselectivity, which was realized by use of a hydroxorhodium/chiral diene complex.