Modifier, modified and conjugated diene-based polymer and methods for preparing them
摘要:
本发明涉及一种改性剂和一种改性和共轭二烯基聚合物,其中包括由此衍生的功能基团,更具体地提供了一种包括由化合物表示的 Formula 1 所代表的改性剂,一种包括从改性剂衍生的功能基团和从共轭二烯基单体衍生的重复单元的改性和共轭二烯基聚合物,以及它们的制备方法。在 Formula 1 中,每个取代基的定义与发明说明中定义的相同。
Sulfoxide ligand metal catalyzed oxidation of olefins
申请人:The Board of Trustees of the University of Illinois
公开号:US10266503B1
公开(公告)日:2019-04-23
The enantioselective synthesis of isochroman motifs has been accomplished via Pd(II)-catalyzed allylic C—H oxidation from terminal olefin precursors. Critical to the success of this goal was the development and utilization of a novel chiral aryl sulfoxide-oxazoline (ArSOX) ligand. The allylic C—H oxidation reaction proceeds with the broadest scope and highest levels asymmetric induction reported to date (avg. 92% ee, 13 examples ≥90% ee). Additionally, C(sp3)-N fragment coupling reaction between abundant terminal olefins and N-triflyl protected aliphatic and aromatic amines via Pd(II)/sulfoxide (SOX) catalyzed intermolecular allylic C—H amination is disclosed. A range of 52 allylic amines are furnished in good yields (avg. 76%) and excellent regio- and stereoselectivity (avg. >20:1 linear:branched, >20:1 E:Z). For the first time, a variety of singly activated aromatic and aliphatic nitrogen nucleophiles, including ones with stereochemical elements, can be used in fragment coupling stiochiometries for intermolecular C—H amination reactions.
Transition-metal-free-catalyzed nucleophilic hydrofunctionalization of both terminal and internal unactivated aliphatic alkenes has been described for the first time. Most topical classes of carbon, nitrogen and oxygen nucleophiles are well-compatible. The highly chemoselective unprotected dinucleophiles are also presented in the atom-economical approach. More than 80 structurally complex β-hetero-substituted
Allylic CH Alkylation of Unactivated α-Olefins: Serial Ligand Catalysis Resumed
作者:Andrew J. Young、M. Christina White
DOI:10.1002/anie.201101654
日期:2011.7.18
A delicate interplay of several kinetically labile ligands is required for reactions that proceed through serial ligand catalysis mechanisms. An investigation of the disruption of this balance has enabled the development of a method for the intermolecular allylicCH alkylation of unactivated as well as activated α‐olefins (see example, Bn=benzyl).
General Allylic C–H Alkylation with Tertiary Nucleophiles
作者:Jennifer M. Howell、Wei Liu、Andrew J. Young、M. Christina White
DOI:10.1021/ja500726e
日期:2014.4.16
A general method for intermolecular allylic C–H alkylation of terminal olefins with tertiary nucleophiles has been accomplished employing palladium(II)/bis(sulfoxide) catalysis. Allylic C–H alkylation furnishes products in good yields (avg. 64%) with excellent regio- and stereoselectivity (>20:1 linear:branched, >20:1 E:Z). For the first time, the olefin scope encompasses unactivated aliphatic olefins
Fe(III)-Catalyzed Hydroallylation of Unactivated Alkenes with Morita–Baylis–Hillman Adducts
作者:Jifeng Qi、Jing Zheng、Sunliang Cui
DOI:10.1021/acs.orglett.8b00108
日期:2018.3.2
An Fe(III)-catalyzed hydroallylation of unactivated alkenes with Morita–Baylis–Hillman adducts via an Fe-catalyzed process is described. A variety of alkenes, including mono-, di-, and trisubstituted alkenes, could all smoothly convert to structural diversified cinnamates in this protocol. Interestingly, when the hydroxyl-containing alkenes were used, various lactones could be rapidly assembled. Moreover