undivided cell, of Ph3P in the presence of a carboxylic acid in CH2Cl2 containing 2,6-lutidinium perchlorate as the supporting electrolyte was shown to generate the corresponding acyloxyphosphonium ion, Ph3P+-OCOR, which was converted in situ to esters, amides, and β-lactams under mild conditions.
结果表明,在羧酸存在下的CH 2 Cl 2中,含高氯酸2,6-lut啶鎓作为辅助电解质的PH 3 P在不分隔的电池中恒流电解会生成相应的酰氧基phosph离子Ph 3 P + -OCOR,在温和条件下原位转化为酯,酰胺和β-内酰胺。
A novel aromatic carbocation-based coupling reagent for esterification and amidation reactions
作者:Thanh V. Nguyen、Demelza J. M. Lyons
DOI:10.1039/c4cc09539a
日期:——
Driven by aromatization: a novel tropylium-based coupling reagent has been developed to facilitate nucleophilic coupling reactions of carboxylic acids.
two-step intermolecular esterification via the condensation of carboxylic acids with nucleophilic hydroxyl species was reported. A broad substrate scope with respect to carboxylic acids, alcohols, and phenols was observed. The α-acyloxyenamide intermediates formed by the addition of carboxylic acids to ynamides proved to be effective acylating reagents for the esterification of alcohol and phenol derivatives
A Convenient Solid-Phase Synthesis of Coumarins by TMSOTf-Catalyzed Intramolecular Seleno-Arylation of Tethered Alkenes
作者:E. Tang、Wen Li、Zhangyong Gao
DOI:10.1055/s-0031-1290618
日期:2012.4
performed using polystyrene-supported succinimidyl selenide as the selenium source. This catalytic process provides an efficient method for the regioselectivesynthesis of dihydrocoumarins possessing a seleno functionality, followed by syn elimination of selenoxides to provide coumarins in good yields and purities. Suzuki cross-coupling reaction of the resin-bound bromodihydrocoumarin was also performed
Metal ion effects in intramolecular reactions. Effects of divalent metal ions on intramolecular acetamido group participation in ester hydrolysis
作者:Thomas H. Fife、Theodore J. Przystas、Mahesh P. Pujari
DOI:10.1021/ja00232a031
日期:1988.11
Catalyse par OH − et les ions metalliques: Cu 2+ , Ni 2+ , Co 2+ , Zn 2+ , dans les reactions d'hydrolyse d'α-acetamidocinnamates d'alkyles ou d'aryles
催化par OH - et les 离子金属:Cu 2+ , Ni 2+ , Co 2+ , Zn 2+ , dans les 反应 d'水解 d'α-乙酰氨基肉桂酸酯 d' 烷基 ou d'aryles