可以轻松制备新的配体,其分子内双核锌络合物可作为高性能催化剂,在非常温和的条件下(1 atm CO 2,室温)进行环己烯氧化物和CO 2的不对称交替共聚,从而提供具有以下性质的完全交替的聚碳酸酯:高达93.8%的对映体过量(ee)和98%的收率。还获得了28 600的高M n值和1.43的相对较窄的多分散度(M w / M n比)。
Access to Chiral 2,5-Pyrrolidinyl Dispirooxindoles via Dinuclear Zinc-Catalyzed Asymmetric Cascade Reactions
作者:Xiao-Chao Yang、Meng-Meng Liu、François Mathey、Hua Yang、Yuan-Zhao Hua、Min-Can Wang
DOI:10.1021/acs.joc.9b00645
日期:2019.6.21
A series of new nonsymmetric semi-azacrown ether ligands were developed and applied to the asymmetric Michael/cyclic keto-imine formation/Friedel–Crafts alkylation reactions of 3-amino oxindole hydrochlorides and β,γ-unsaturated α-keto amides. A diversity of 2,5-pyrrolidinyl dispirooxindoles containing two nonadjacent spiro-quaternary stereocenters were obtained in excellent diastereoselectivities
This invention aims at providing a catalyst for producing an optically active aldehyde or an optically active ketone, which is an optically active carbonyl compound, by carrying out selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, particularly a catalyst which is insoluble in a reaction mixture for obtaining optically active citronellal which is useful as a flavor or fragrance, by carrying out selective asymmetric hydrogenation of citral, geranial or neral; and a method for producing a corresponding optically active carbonyl compound. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table is supported on a support, an optically active cyclic nitrogen-containing compound and an acid.
A new ligand can be easily prepared, and its intramolecular dinuclear zinc complexes act as a high performance catalyst for the asymmetric alternating copolymerization of cyclohexene oxide and CO2 under very mild conditions (1 atm CO2, room temperature), affording completely alternating polycarbonates with up to 93.8 % enantiomeric excess (ee) and 98 % yield. A high Mn value of 28 600 and a relatively
可以轻松制备新的配体,其分子内双核锌络合物可作为高性能催化剂,在非常温和的条件下(1 atm CO 2,室温)进行环己烯氧化物和CO 2的不对称交替共聚,从而提供具有以下性质的完全交替的聚碳酸酯:高达93.8%的对映体过量(ee)和98%的收率。还获得了28 600的高M n值和1.43的相对较窄的多分散度(M w / M n比)。
There is disclosed a chiral phosphine compound of formula (1):
1
chiral phosphine compound is suitably used to produce a transition metal complex that is useful as an asymmetric reaction catalyst.