Asymmetric Visible-Light Photoredox Cross-Dehydrogenative Coupling of Aldehydes with Xanthenes
作者:Evgeny Larionov、Marco M. Mastandrea、Miquel A. Pericàs
DOI:10.1021/acscatal.7b02659
日期:2017.10.6
cross-coupling of two C(sp3)–H bonds employing visiblelight as an economical and environmentally benign source of energy. Photoredox catalysis is used for the oxidation of a diarylmethane to the corresponding cation, which is then trapped by an enamine intermediate generated in situ from an aldehyde reactant and a secondary amine organocatalyst. Notably, this mild method is an ideal synthetic approach from the
Organocatalytic Enantioselective Dehydrogenative<i>α</i>-Alkylation of Aldehydes with Benzylic Compounds
作者:Fen Huang、Lubin Xu、Jian Xiao
DOI:10.1002/cjoc.201200850
日期:2012.11
The highly enantioselective cross‐dehydrogenativecoupling of aldehydes with benzylic compounds has been developed as an efficient and rapid protocol for synthesis of enantioriched α‐alkylated aldehydes.
The acid free asymmetric intermolecular α-alkylation of aldehydes in fluorinated alcohols
作者:Jian Xiao、Kai Zhao、Teck-Peng Loh
DOI:10.1039/c2cc30261f
日期:——
The acid free asymmetric intermolecular α-alkylation of aldehydes with alcohols has been discovered using trifluoroethanol as solvent. This unprecedented system affords the enantioenriched functionalized primary alcohols (after NaBH4 reduction) in high yields and good to excellent enantioselectivities with wide substrate scope in the absence of any acid additive.
Lead-halide perovskite quantum dots embedded in mesoporous silica as heterogeneous photocatalysts combined with organocatalysts for asymmetric catalysis
environments. Hence, we embedded CsPbBr3 quantum dots into KIT-6 mesoporous silica to form silica-shell-protected heterogeneous photocatalysts (CsPbBr3@KIT-6), which were further combined with chiral organocatalysts to explore the activity and stereoselectivity in asymmetric photocatalysis. The well-dispersed CsPbBr3 in KIT-6 channels provides more active sites and exhibits excellent enantioselectivity
Merging Organocatalysis with Transition Metal Catalysis: Highly Stereoselective α-Alkylation of Aldehydes
作者:Jian Xiao
DOI:10.1021/ol3002859
日期:2012.4.6
The unprecedented cooperative systems involving a diarylprolinol silyl ether with various Lewis acids have been found to effect the highly enantioselective intermolecular alpha-alkylation of aldehydes. A wide variety of aldehydes and alcohols can be transformed into the desired highly functionalized aldehydes In high yields, excellent enantioselectivities, and good diastereoselectivities at room temperature under mild conditions.