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.
Transition metal-catalyzed addition reactions of arylboronic acids with alkyl 2-formylbenzoates: efficient access to chiral 3-substituted phthalides
作者:Chun-Hui Xing、Yuan-Xi Liao、Ping He、Qiao-Sheng Hu
DOI:10.1039/c001104e
日期:——
Transition metal-catalyzed addition of arylboronicacids to 2-formylbenzoates afforded 3-substituted phthalides. By using SPINOL-based phosphites as ligands, a Rh(I)-catalyzed asymmetric version of such an addition reaction was achieved.
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.
rhodium‐catalyzed addition of aryl and alkenyl boronic acids to phthalaldehyde and subsequent intramolecular esterification is described (see scheme; cod=1,5‐cyclooctadiene, dppb=1,4‐bis(diphenylphosphino)butane). The method is facile and practical for accessing 3‐aryl and 3‐alkenyl phthalides in moderate to good yields. Several functional groups are tolerated under the reaction conditions.
Rhodium or Palladium-Catalyzed Cascade Aryl Addition/ Intramolecular Lactonization of Phthalaldehyde with Potassium Organotrifluoroborates to Access 3-Arylphthalides
An efficient rhodium-catalyzed lactonization of phthalaldehyde with potassiumorganotrifluoroborates to access3-arylphthalides has been developed. Moreover, palladium is a also good catalyst for such transformation.