Catalytic Enantioselective Synthesis of Chiral Phthalides by Efficient Reductive Cyclization of 2-Acylarylcarboxylates under Aqueous Transfer Hydrogenation Conditions
作者:Bo Zhang、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ol901674k
日期:2009.10.15
A new diamine ligand for asymmetrictransferhydrogenation (ATH) was discovered. The reductive cyclization of 2-acylarylcarboxylates was found to proceed highly stereoselectively by the new Ru complex-catalyzed ATH and subsequent in situ lactonization under aqueous conditions. It enables efficient access to a wide variety of 3-substituted phthalides in enantiomericallypure form.
Pd-free Sonogashira coupling: one pot synthesis of phthalide via domino Sonogashira coupling and 5-exo-dig cyclization
作者:Shubhendu Dhara、Raju Singha、Munmun Ghosh、Atiur Ahmed、Yasin Nuree、Anuvab Das、Jayanta K. Ray
DOI:10.1039/c4ra07639g
日期:——
Phthalides have been synthesized exclusively in one pot via Pd-free Sonogashira coupling.
邻苯二甲酸酯已经通过无钯Sonogashira偶联一锅法合成。
Rhenium‐Catalyzed Arylation–Acyl Cyclization between Enol Lactones and Organomagnesium Halides: Facile Synthesis of Indenones
作者:Binjing Hu、Xinyi Cheng、Ying Hu、Xingchen Liu、Konstantin Karaghiosoff、Jie Li
DOI:10.1002/anie.202103465
日期:2021.7.5
A set of rhenium-catalyzed arylation–acyl cyclizations between (hetero)arylmagnesium halides and enol lactones through a cascade C(sp2)−C(sp2)/C(sp2)−C(sp2) bondformation under mild reaction conditions has been developed. Indeed, a wide range of functional groups on both organomagnesium halides and enol lactones is well tolerated by the simple rhenium catalysis, thus furnishing polyfunctionalized
When 2-ethynylbenzoic acids were treated with a catalytic amount of a rhenium complex, such as ReCl(CO())5, 6-endo cyclization of 2-ethynylbenzoic acids proceeded with a high selectivity to give the corresponding isocoumarins in moderate to good yields.
Ruhemann, Chemische Berichte, 1891, vol. 24, p. 3968