Asymmetric Retro-Claisen Reaction by Synergistic Chiral Primary Amine/Palladium Catalysis
作者:Yanfang Han、Long Zhang、Sanzhong Luo
DOI:10.1021/acs.orglett.9b02491
日期:2019.9.20
We described herein a chiral primaryamine/palladium catalyzed asymmetric retro-Claisen reaction of β-diketones with salicylic carbonates. A series of chiral α-alkylated ketones and macrolides were obtained with good yields and excellent enantioselectivities upon a sequence of decarboxylative benzylation, retro-Claisen cleavage, and enamine protonation. This strategy features broad substrate scope
Asymmetric Allylation of Unsymmetrical 1,3-Diketones Using a BINAP−Palladium Catalyst
作者:Ryoichi Kuwano、Kei-ichi Uchida、Yoshihiko Ito
DOI:10.1021/ol034665s
日期:2003.6.1
[reaction: see text] The chiral palladium complex generated in situ from [Pd(eta(3)-allyl)Cl](2) and (R)-BINAP is a good catalyst for the catalytic asymmetricallylation of 1,3-diketones. The reaction provided chiral 2,2-dialkyl-1,3-diketones with 64-89% ee in high yields (13 examples). Enantiomeric excesses are strongly affected by the gamma-substituent of the allylic substrates. A variety of unsymmetrical
New bicyclic dioxanes, their preparation and their use as organoleptic compounds
申请人:V.Mane Fils
公开号:EP2287159A1
公开(公告)日:2011-02-23
The present invention relates to novel 1,3-dioxane derivatives of formula (I)
wherein each of R1 and R2 is a hydrogen atom, R3 and R4 are independently a hydrogen atom, a linear or branched C1-C6 alkyl group, or a linear or branched C2-C6 alkenyl group, and R5 is a linear or branched C1-C6 alkyl group, a linear or branched C2-C6 alkenyl group or a (CH2)0-2 - aryl group, and R6 and R7 are independently a hydrogen atom, a linear or branched C1-C6 alkyl group, a linear or branched C2-C6 alkenyl group or a (CH2)0-2 - aryl group, or R6 and R7 together with the carbon atom to which they are attached form a C5-C6 cycloalkyl group or a C5-C6 cycloalkenyl group, substituted or not; their preparation and their use as organoleptic compounds.
[EN] NEW BICYCLIC DIOXANES, THEIR PREPARATION AND THEIR USE AS FRAGRANT COMPOUNDS<br/>[FR] NOUVEAUX DIOXANES BICYCLIQUES, LEUR PRÉPARATION ET LEUR UTILISATION EN TANT QUE COMPOSÉS DE PARFUM
申请人:MANE FILS V
公开号:WO2011013077A1
公开(公告)日:2011-02-03
The invention is directed to the use of compounds of formula (I), as fragrant agents. In this formula: - R3 and R4 are independently a hydrogen atom, a C1-C6 alkyl group or a C2-C6 alkenyl group, R5 is a C1-C6 alkyl group, a C2-C6 alkenyl group or a (CH2)0-2-aryl group, R6 is a C1 -C6 alkyl group, a C2-C6 alkenyl group, a (CH2)0-2-aryl group or a C5- C6 cycloalkyl or cycloalkenyl group, and R7 is a hydrogen atom, a C1-C6 alkyl group or a C2-C6 alkenyl group; or R3, R4 and R5 are as above defined, and R6 and R7 together with the carbon atom to which they are attached form a C5-C6 cycloalkyl or cycloalkenyl group.
Hydrogenated Benzo (C) Thiophene Derivatives as Immunomodulators
申请人:Bolli Martin
公开号:US20080176926A1
公开(公告)日:2008-07-24
The invention relates to novel thiophene derivatives, their preparation and their use as pharmaceutically active compounds. Said compounds particularly act as immunosuppressive agents.