Diphenylprolinol silyl ether as a catalyst in an asymmetric, catalytic and direct α-benzoyloxylation of aldehydes
作者:Hiroaki Gotoh、Yujiro Hayashi
DOI:10.1039/b902287b
日期:——
Diphenylprolinol silyl ether was found to promote asymmetric, catalytic and direct α-benzoyloxylation of aldehydes with benzoyl peroxide to afford oxidized products in good yields with excellent enantioselectivity.
Nitrogen-tethered bisimidazoline (Nb-imidazoline) ligand was utilized in the Cu(I)-catalyzed benzoylation of 1,2-diols. With the assistance of i-Pr(2)NEt, the reaction of rac-1,2-diols with o-methylbenzoyl chloride was smoothly catalyzed by Nb-imidazoline-CuCl in CH(2)Cl(2) to give the corresponding o-methylbenzoylated secondary alcohols in tip to 79% ee.
Kano, Taichi; Mii, Haruka; Maruoka, Keiji, Journal of the American Chemical Society, 2009, vol. 131, p. 3450 - 3451
作者:Kano, Taichi、Mii, Haruka、Maruoka, Keiji
DOI:——
日期:——
Practical one-pot sequence for the asymmetric synthesis of 1,2 diols from primary alcohols
practical one-pot three-step sequence is reported for the asymmetric synthesis of α-benzoyloxylated alcoholsfromprimaryalcohols. Good overall yields (36–52%) and enantioselectivities (91–94% e.e.) are obtained using a commercial organocatalyst in the key oxylation reaction. A simple modification in the protocol allows the formation of enantioenriched γ-benzoyloxylated α,β-unsaturated ester from alcohol