Controllable construction of isoquinolinedione and isocoumarin scaffolds <i>via</i> Rh<sup>III</sup>-catalyzed C–H annulation of <i>N</i>-tosylbenzamides with diazo compounds
An efficient protocol for the synthesis of isoquinolinediones by RhIII-catalyzed C–H activation/annulation/decarboxylation of N-tosylbenzamides with diazo compounds is reported.
annulation of 2-iodo enol esters leading to 4- and 3,4-substituted isocoumarins was accomplished selectively at room temperature. Coupling of 2-iodo benzoic acids with enolates that were produced in situ from the simple esters was also performed to produce isocoumarins under analogous reaction conditions. Owing to the mildness of the current protocol, 4-acyl 3-substitutedisocoumarins were efficiently produced
Copper-catalyzed one-pot reactions of acetyl chloride, o-halobenzoic acids and Wittig reagents toward 3-methyl isocoumarin synthesis
作者:Xuwen Chen、Yunyun Liu
DOI:10.1039/c7ra06707k
日期:——
The one-pot reactions of acetylchloride, o-halobenzoic acids and Wittig reagents providing 3-methyl isocoumarins have been furnished via tandem Wittig reaction, oxa-Michael addition and C–C cross coupling. Three new chemical bonds including one C–O, one CC and one C–C bond are generated via the catalysis of a simple copper salt for the heterocycle construction.