Diastereoselective Mukaiyama aldol reaction of 2-(trimethylsilyloxy)furan catalyzed by bismuth triflate.
We have developed an efficient vinylogous Mukaiyama aldol reaction of 2-(trimethylsilyloxy)furan with various aromatic aldehydes mediated by bismuth triflate in low catalyst loading (1 mol %). The reaction proceeds rapidly and affords the corresponding 5-(hydroxy(aryl)methyl)furan-2(5H)-ones in high yields with good to very good diastereoselectivities (dr up to >98:2). Such selectivities, albeit previously reported with other Lewis acids, could this time be achieved with a much lower catalyst loading. 5-(Hydroxy(alkyl)methyl)furan-2(5H)-ones derived from ketones could also be obtained with good diastereoselectivities.
Ollevier
Thierry
T
Département de chimie, Université Laval, Québec, Canada G1K 7P4. thierry.ollevier@chm.ulaval.ca
Bouchard
Jean-Emmanuel
JE
Desyroy
Valerie
V