Strong counteranion effects on the catalytic activity of cationic silicon Lewis acids in Mukaiyama aldol and Diels-Alder reactions.
[chemical reaction: see text]. A toluene-coordinated silyl borate, [Et3Si(toluene)]B(C6F5)4, demonstrated catalytic activities significantly higher than those of Me3SiOTf and Me3SiNTf2 in Mukaiyama aldol and Diels-Alder reactions.
Hara
Kenji
K
Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan.
Akiyama
Ryuto
R
Sawamura
Masaya
M