Enantioselective Synthesis of 4,4′-Biaryl-BINOLs from Arynes and β-Diketones
摘要:
The reaction of 2-(trimethylsilyl) phenyl triflate with aroylacetones in the presence of CsF gave the corresponding 4-aryl-2-naphthols. Substituted triflates also reacted with aroylacetones to afford 4-aryl-2-naphthols regioselectively. The enantioselective oxidation of 4aryl-2-naphthols with a chiral tridentate oxovanadium(IV) complex furnished the corresponding 4,4'-biaryl-1,1'-binaphthols in good yields.
By taking advantage of chirality-transfer strategy, a chemo- and regioselectiveallylicalkylation of naphthols and phenols with vinylaziridines provides an atom-economic and efficient method for the synthesis of enantioenriched 2-vinyl-2-arylethylamine derivatives. Use of readily available starting materials, a broad substrate scope, high selectivity, mild reaction conditions, as well as versatile
Friedel–Crafts alkylation reaction of β‐naphthols with donor–acceptor aminocyclopropane was developed. In the presence of a copper complex derived from Cu(OTf)2 and bisoxazoline, a series of γ‐substituted γ‐aminobutyric acid derivatives were obtained with good yields (up to 98 %) and excellent enantioselectivities (up to 98 %). Using this catalytic system, the 2‐amino cyclopropane‐1,1‐dicarboxylate was obtained
Tandem carbon–carbon bond insertion and intramolecular aldol reaction of benzyne with aroylacetones: novel formation of 4,4′-disubstituted 1,1′-binaphthols
An efficient route to 4-aryl-2-naphthols from arynes and aroylacetones was developed by carbon-carbon bond insertion followed by an intramolecular aldol reaction and dehydration. Benzyne derived from 2-(trimethylsilyl)phenyl triflate reacted with benzoylacetones in refluxing acetonitrile to give 4-aryl-2-naphthols and 3-aryl-1-naphthols.
The reaction of 2-(trimethylsilyl) phenyl triflate with aroylacetones in the presence of CsF gave the corresponding 4-aryl-2-naphthols. Substituted triflates also reacted with aroylacetones to afford 4-aryl-2-naphthols regioselectively. The enantioselective oxidation of 4aryl-2-naphthols with a chiral tridentate oxovanadium(IV) complex furnished the corresponding 4,4'-biaryl-1,1'-binaphthols in good yields.
Palladium(<scp>ii</scp>)-catalyzed meta-selective direct arylation of O-β-naphthyl carbamate
作者:Jingchang Zhang、Qingwen Liu、Xufei Liu、Suoqin Zhang、Pingping Jiang、Yanxiang Wang、Shengyuan Luo、Yang Li、Qifeng Wang
DOI:10.1039/c4cc07997c
日期:——
could be introduced in moderate to good yields. Mechanistic investigation shows that the carbamate substituent has a unique effect and the reaction undergoes an ortho-carbometallation/meta-direct arylation process.