A rhodium or palladium-catalyzedaddition of boronic acids to phthalaldehydonitrile, followed by an intramolecularlactonization of cyano to access 3-substituted phthalides, is described. This procedure tolerates a series of functional groups, such as methoxy, fluoro, chloro, and vinyl groups. It is a novel procedure for the synthesis of 3-arylphthalides.
A palladium-catalyzedaddition of arylboronic acids to phthalaldehyde, followed by an intramolecularlactonization to access 3-substituted phthalides, is described. The procedure tolerates a series of functional groups, such as methoxyl, fluoro, chloro, and trifluoromethyl groups. It represents a procedure for the synthesis of 3-substituted phthalides.
Catalytic asymmetric synthesis of 3-aryl phthalides enabled by arylation–lactonization of 2-formylbenzoates
作者:Andressa M. M. Carlos、Rafael Stieler、Diogo S. Lüdtke
DOI:10.1039/c8ob02872a
日期:——
The catalytic asymmetric synthesis of 3-aryl phthalides is reported through a sequential asymmetric arylation–lactonization reaction. The reaction is enabled by a boron–zinc exchange to generate reactive arylating agents, which react with 2-formylbenzoates in the presence of a chiral amino naphthol ligand. The enantiodetermining step is the arylation of the aldehyde, which then undergoes a lactonization
Reactivity toward Oxygen of Isobenzofuranyl Radicals: Effect of Nitro Group Substitution
作者:Enrique Font-Sanchis、Carolina Aliaga、Raecca Cornejo、J. C. Scaiano
DOI:10.1021/ol034307p
日期:2003.5.1
the p-phenyl position dramatically slows down the oxygenation of isobenzofuranyl radicals. However, both unsubstituted and m-substituted phenyl rings have no appreciable influence on the reactivitytoward oxygen. Spin delocalization on the nitro group is proposed to explain the stability of the carbon-centered radical generated. [reaction: see text]