An extension of nickel-catalyzed reductive coupling between tertiary alkyl halides with allylic carbonates
作者:Yingying Yu、Haifeng Chen、Qun Qian、Ken Yao、Hegui Gong
DOI:10.1016/j.tet.2018.07.057
日期:2018.9
The nickel catalyzed reductive coupling of allyliccarbonates with chloro-cyclotryptamine analogs to construct sterically congested all C(sp3) quaternary centers has been achieved with emphasis on the substrate scope. And the using of dienyl methyleneyl carbonates coupling with a variety of tertiary alkylhalides furnished the dienylated products improved the reaction's applicability.
Asymmetric, Regioselective Bromohydroxylation of 2-Aryl-2-propen-1-ols Catalyzed by Quinine-Derived Catalysts
作者:Ye Zhang、Hui Xing、Weiqing Xie、Xiaolong Wan、Yisheng Lai、Dawei Ma
DOI:10.1002/adsc.201200782
日期:2013.1.14
The asymmetricbromohydroxylation of 2‐aryl‐2‐propen‐1‐ols catalyzed by quinine‐derived bifunctional catalyst has been developed. The regioselectivity was controlled by employing a boronate ester as tether which was formed in situ and enantioselectivity was introduced by taking advantage of a quinine‐derived bifunctional catalyst which activated the boronate ester and N‐bromosuccinimide (NBS) at the
Nickel-catalyzed enantioselective hydrovinylation of silyl-protected allylic alcohols: An efficient access to homoallylic alcohols with a chiral quaternary center
Asymmetric hydrovinylation of silyl-protected allylicalcoholscatalyzed by nickel complexes of chiral spiro phosphoramidite ligands was developed. A series of homoallylicalcohols with a chiral quaternary center were produced in high yields (up to 97%) and high enantioselectivities (up to 95% ee). The reaction provides an efficient method for preparing bifunctional compounds with a chiral quaternary
α-Quaternary Chiral Aldehydes from Styrenes, Allylic Alcohols, and Syngas via Multi-catalyst Relay Catalysis
作者:Jing Meng、Lian-Feng Fan、Zhi-Yong Han、Liu-Zhu Gong
DOI:10.1016/j.chempr.2018.03.010
日期:2018.5
synthesizes organic molecules, multi-catalyst relay catalysis (MCRC), based on the seamless combination of a series of catalyticreactions, has emerged as a promising strategy for achieving ideal synthesis. In such systems, each step takes place orderly and sequentially. Taken as a whole, the entire process appears indistinguishable from a common one-step reaction but provides a means for extraordinary transformations
Enantioselective Rh-Catalyzed Anti-Markovnikov Hydroformylation of 1,1-Disubstituted Allylic Alcohols and Amines: An Efficient Route to Chiral Lactones and Lactams
Rh-catalyzed highly enantioselective anti-Markovnikov hydroformylation of 1,1-disubstituted allylic alcohols and amines has been achieved. By using a chiral hybrid phosphorus ligand, a series of challenging 1,1-disubstituted allylic alcohols and amines were transformed to valuable chiral lactones and lactams with good yields and high enantioselectivities (up to 90% yield and 93% enantiomeric excess
已经实现了Rh催化的1,1-二取代的烯丙基醇和胺的高对映选择性的反马尔科夫尼科夫加氢甲酰基化。通过使用手性杂化磷配体,将一系列具有挑战性的1,1-二取代的烯丙醇和胺转化为有价值的手性内酯和内酰胺,具有良好的收率和高对映选择性(高达90%的收率和93%的对映体过量(ee))在非常温和的反应条件下(50°C,CO / H 2 = 2.5 / 2.5 bar)。此外,还实现了克级反应和多种合成转化,证明了该方法的广泛合成效用。