Microwave-accelerated cross-metathesis reactions of N-allyl amino acid substrates
摘要:
Microwave heating has been utilised for the cross-metathesis reaction of N-allyl amino acid substrates to generate olefin homodimers. Remarkable acceleration of the cross-metathesis reaction (minutes compared to hours) over conventional reflux heating was observed. In addition, improved reaction yields and similar E/Z ratios for the cross-metathesis products were achieved. (c) 2005 Published by Elsevier Ltd.
3,5-Bis(n-perfluorooctyl)benzyltriethylammonium Bromide (F-TEBA): An Efficient, Easily Recoverable Fluorous Catalyst for Solid-Liquid PTC Reactions
作者:Gianluca Pozzi、Voichiţa Mihali、Francesca Foschi、Michele Penso、Silvio Quici、Richardâ H. Fish
DOI:10.1002/adsc.200900631
日期:2009.12
reacted under mildconditions to give 3,5-bis(n-perfluorooctyl)benzyltriethylammonium bromide (F-TEBA), an analogue of the versatile phase-transfer catalyst, benzyltriethylammonium chloride (TEBA), containing two fluorous ponytails. This perfluoroalkylated quaternary ammonium salt was successfully employed as a catalyst in a variety of reactions run under solid-liquidphase-transfercatalysis (SL-PTC) conditions
Chiral ammonium-oxocarbenium dications are accumulated in superacid through a tandem diastereoselective proton-transfer/intramolecular cyclization. Their reactivity in the diastereoselective remote functionalization of non-activated alkene is explored.