作者:Teruaki Mukaiyama、Nobuharu Iwasawa、Rodney W. Stevens、Toru Haga
DOI:10.1016/s0040-4020(01)82423-6
日期:1984.1
A highly diastereoselective cross aldolreaction is developed using divalent tin enolates formed from stannous trifluoromethanesulfonate and carbonyl compounds. The reaction is extended to a highly enantioselective cross aldolreaction employing chiral diamines derivedfrom (S)-proline as ligands.
STANNOUS TRIFLATE: A FACILE CROSS-ALDOL REACTION BETWEEN TWO KETONES VIA DIVALENT TIN ENOLATES
作者:Rodney W. Stevens、Nobuharu Iwasawa、Teruaki Mukaiyama
DOI:10.1246/cl.1982.1459
日期:1982.9.5
Divalent tinenolates, formed from stannous triflate and ketones, react with a second ketone under mild conditions to afford the corresponding cross-aldol products in good to excellent yields. In the case of the cross-coupling with aromatic ketone, enhanced threo-selectivity was observed.
The reductive aldol reaction of enones has been established catalyzed by Br2InOMe (cat.)–MePhSiH2 system where Br2InH acted as an active catalytic species. Addition of 1.0 equivalent of MeOH was essential for catalytic turnover. The system, Br2InOMe(cat.)–MePhSiH2–MeOH, provided highly chemo- and diastereoselectivereductive aldol reaction of enones with functionalized substrates such as α-bromo carbonyls