A wide variety of alcohols, phenols and amines are efficiently and selectively converted into the corresponding acetates by treatment with acetic anhydride in the presence of catalytic amounts of La(NO3)3·6H2O undersolvent-freeconditions at room temperature. The method is compatible with acid sensitive hydroxyl protecting groups such as TBDMS, THP, OBz, OBn, Boc and some isopropylidenes and offers
In situ generated acylimidazolium acetate as an efficient catalyst and acylating agent for the acetylation of alcohols, phenols, and amines at ambient temperature
作者:Najmeh Nowrouzi、Seyedeh Zahra Alizadeh
DOI:10.1016/s1872-2067(12)60660-3
日期:2013.9
Abstract Acylimidazolium acetate was readily prepared in situ from the reaction of imidazole with acetic anhydride and subsequently acted as a catalyst and acylating agent for the efficient acetylation of alcohols, phenols, and amines at ambient temperature.
(Trimethylsilyl)ethoxyacetylene, a stable and easy to handle dehydrating reagent, is quite effective for the title condensation to prepare esterlactone-, lactam-, and peptide-linkages under mild conditions.
An evaluation of palladium-based catalysts for the base-free borylation of alkenyl carboxylates
作者:Gregory Gaube、Nahiane Pipaon Fernandez、David C. Leitch
DOI:10.1039/d1nj04008a
日期:——
Synthesis of organoboron derivatives is a key application of catalytic cross-coupling, with the Pd-catalyzed Miyaura borylation among the most versatile methods available. We have evaluated several Pd-based systems for borylation of alkenyl acetates and pivalates, with the optimal system heavily dependant on the substrate structure.
A series of η4-acyloxycyclohexadiene–Fe(CO)3 complexes was prepared and fully characterized by spectroscopic methods including single crystal X-ray diffraction. For this purpose a new synthetic access to differently acylated 1,3- and 1,5-dienol–Fe(CO)3 complexes was developed. The enzymatically triggered CO release from these compounds was monitored (detection of CO through GC and/or by means of a