A Practical Synthesis of β-Keto Phosphonates from Triethyl Phosphonoacetate
摘要:
An efficient and practical preparation of beta-keto phosphonates, via acylation reaction of triethyl phosphonoacetate with carboxylic acid chlorides in the presence of magnesium chloride-triethylamine followed by decarbethoxylation, is described.
Silica-supported HClO<sub>4</sub> promotes catalytic solvent- and metal-free O–H insertion reactions with diazo compounds
作者:Rafael Douglas C. Gallo、Antonio C. B. Burtoloso
DOI:10.1039/c8gc02574f
日期:——
employing rhodium acetate dimer, this method uses eco-friendly silica-supported HClO4 as the catalyst. Only 0.3 mol% of this Brønsted acid catalyst, that can also be recycled several times, is necessary to guarantee very good yields (up to 97%) in the O–H insertion reactions. Reaction set-up is simple and permitted the preparation of forty-three α-hydroxy and α-alkoxy esters/ketones in just 1 h and at room