catalytic system of rhodium catalyst and Zn(OAc)2 additive. The presence of Zn(OAc)2 obviously accelerates the C(sp2)–H activation and destructed the formation of carboxylic ester that is formed via a nucleophilic O–H insertion to metal carbenoid. The procedure featured mild reaction conditions and broad substrate scope, providing a straightforward approach to the synthesis of α-pyrones and isocoumarins without
Rh(<scp>iii</scp>)-catalyzed C–H activation/cyclization of benzamides and diazo compounds to form isocoumarins and α-pyrones
作者:Xing Guang Li、Min Sun、Kai Liu、Qiao Jin、Pei Nian Liu
DOI:10.1039/c4cc09314c
日期:——
Rhodium-catalyzed intermolecular cyclization of benzamides and diazo compounds via C–H activation has been achieved to construct C–C/C–O bonds for the first time.
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.
Datta, D.; Tirodkar, R. B.; Usgaonkar, R. N., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1980, vol. 19, # 8, p. 641 - 643