Tetrabutylammonium hydrogen sulfate catalyzed eco-friendly and efficient synthesis of glycosyl 1,4-dihydropyridines
作者:Neetu Tewari、Namrata Dwivedi、Rama P. Tripathi
DOI:10.1016/j.tetlet.2004.10.057
日期:2004.11
An efficient and eco-friendly synthesis of glycosyl 1,4-dihydropyridines has been achieved by a three-component reaction of β-keto esters or ketones, enamines and glycosyl aldehydes in the presence of tetrabutylammoniumhydrogensulfate as catalyst in diethylene glycol.
Diastereoselective C-alkylation of aldimines, derived from chiral α-carbon heteroatom-substituted aldehydes, with triethylborane. Application to the synthesis of benzylisoquinolines
作者:David Fuentes-Ríos、Carmen Muñoz、Amelia Díaz、Francisco Sarabia、J. Manuel López-Romero
DOI:10.1039/d3ra01397a
日期:——
aliphatic amines, good yields and moderate to high diastereoselectivity are obtained: yields are significantly better when the preformed imine is used in the reaction with triethyl borane, and diastereoselectivity of the reactions largely depends on the structure of the chiral aliphatic amine. The methodology is successfully applied to the synthesis of romneine, a natural benzylisoquinoline.