Catalytic Enantioselective Epoxidation of Tertiary Allylic and Homoallylic Alcohols
作者:José Luis Olivares-Romero、Zhi Li、Hisashi Yamamoto
DOI:10.1021/ja401182a
日期:2013.3.6
for the enantioselective epoxidation of both tertiary allylic and homoallylicalcoholscatalyzed by Hf(IV)-bishydroxamic acid (BHA) complexes is described. Asymmetric epoxidation, kinetic resolution, and desymmetrization have been developed, demonstrating the flexible nature of the Hf(IV)-BHA system. This is the first report in which these substrates were obtained with enantioselectivities of up to
The Catalyzed Desulfinylative Allylation of Carbonyl Compounds with Alk-2-enesulfonyl Chlorides and Silyl Alk-2-enesulfinates
作者:Chandra M. R. Volla、Dean Marković、Sylvain Laclef、Pierre Vogel
DOI:10.1002/chem.201000705
日期:——
Coupling up with sulfonyl chlorides: An ene reaction of alkenes with SO2⋅BCl3 permits the one‐pot conversion of simple alkenes into β,γ‐unsaturated sulfonyl chlorides or sulfinic silyl esters. These compounds can then be used as nucleophilic allylating agents with aldehydes and ketones to generate the corresponding homoallylic alcohols (see scheme) with good chemo‐ and diastereoselectivity in the presence
Enantioselective Pd(ii)–Pd(iv) catalysis utilizing a SPRIX ligand: efficient construction of chiral 3-oxy-tetrahydrofurans
作者:Kazuhiro Takenaka、Yogesh D. Dhage、Hiroaki Sasai
DOI:10.1039/c3cc44797a
日期:——
Novel enantioselective catalysis involving a Pd(II)âPd(IV) cycle was developed by utilizing a SPRIX ligand. Treatment of alkenyl alcohols with a catalytic amount of PdâSPRIX and TfOH in the presence of PhI(OAc)2 gave optically active 3-oxy-tetrahydrofuran derivatives in good yields.
SmCl3-catalyzed electrochemical reductive allylation of ketones
作者:Hassan Hebri、Elisabet Duñach、Jacques Périchon
DOI:10.1016/s0040-4039(00)60322-2
日期:1993.2
A series of homoallylic alcohols was prepared in moderate to good yields from allyl chlorides and ketones, through an electrochemical method using SmCl3 as the catalyst precursor. The electrosyntheses were carried out in undivided cells fitted with a consumable magnesium anode.