已经报道了由2-甲氧基查耳酮环氧化物构造2-芳基苯并[ b ]呋喃的有效方法。2-甲氧基查尔酮环氧化物在2 mol%的BF 3 ·Et 2 O催化下进行Meerwein重排,然后在一锅中进行甲酰化反应,成功制得2-甲氧基脱氧安息香素。之后,通过2-甲氧基脱氧安息香与48%HBr的分子间环脱水,获得了高收率(87%–100%)的2-芳基苯并[ b ]呋喃。利用这种方法,可以方便地合成天然产物呋喃喃甲酸酯A和类花生四烯酸类化合物6的关键中间体。
已经报道了由2-甲氧基查耳酮环氧化物构造2-芳基苯并[ b ]呋喃的有效方法。2-甲氧基查尔酮环氧化物在2 mol%的BF 3 ·Et 2 O催化下进行Meerwein重排,然后在一锅中进行甲酰化反应,成功制得2-甲氧基脱氧安息香素。之后,通过2-甲氧基脱氧安息香与48%HBr的分子间环脱水,获得了高收率(87%–100%)的2-芳基苯并[ b ]呋喃。利用这种方法,可以方便地合成天然产物呋喃喃甲酸酯A和类花生四烯酸类化合物6的关键中间体。
N-heterocyclic carbene-palladium-imine complex catalyzed α-arylation of ketones with aryl and heteroaryl chlorides under air atmosphere
作者:Hui-Yang Lu、An Shen、Yong-Qing Li、Yu-Cai Hu、Chen Ni、Yu-Cai Cao
DOI:10.1016/j.tetlet.2020.152124
日期:2020.7
synthesized and unambiguously confirmed by X-ray single crystal diffraction. It was found to be an efficient and air-stable catalyst for the α-arylation of ketones. The reaction could be operated in air without any negative effect. Non-activated aryl and heteroaryl chlorides have been successfully applied in the reaction with only 0.5 mol% catalyst loadings under air atmosphere. Excellent to good product yields
BF 3 ·OEt 2 -mediated [1,2]-aryl shift: Synthesis of functionalized α-arylnitriles via the bromination/cyanation/deformylation of substituted deoxybenzoin
作者:Chieh-Kai Chan、Meng-Yang Chang
DOI:10.1016/j.tet.2017.07.015
日期:2017.8
A new sequential, tandem synthesis of functionalized α-arylnitriles via the bromination/cyanation/deformylation of substituted deoxybenzoin has developed. CuBr2-promoted bromination of substituted deoxybenzoins gives 2-bromo-2-arylacetophenne 3. The cyanation of 3 with sodium cyanide (NaCN) generates epoxynitrile. Then, a treatment of epoxynitrile with BF3·OEt2 results in the formation of functionalized
Iron‐Promoted Domino Dehydrogenative Annulation of Deoxybenzoins and Alkynes Leading to β‐Aryl‐α‐Naphthols
作者:Xue‐Qing Zhu、Rui‐Li Guo、Xing‐Long Zhang、Ya‐Ru Gao、Qiong Jia、Yong‐Qiang Wang
DOI:10.1002/adsc.202000625
日期:2020.8.4
A strategy for synthesis of β‐aryl‐α‐naphthols has been established through an iron‐promoted domino C(sp 3)−H/C(sp )−H and C(sp 2)−H/C(sp )−H dehydrogenative coupling of deoxybenzoins and alkynes. The synthesis uses inexpensive materials with a broad substrate scope and features simple operations with excellent regioselectivity. This study provides an alternative access to various β‐aryl‐α‐naphthols
The use of commercially available (SIPr)Pd(cinnamyl)Cl (SIPr = 1,3-bis(2,6-diisopropylphenyl)-4,5-dihydroimidazol-2-ylidene) as a precatalyst for the anaerobic oxidation of secondary alcohols is described. The use of this complex allows for a drastic reduction in the reaction times and catalyst loading when compared to the unsaturated counterpart. This catalytic system is compatible with the use of microwave dielectric heating, decreasing even further catalyst loading and reaction times. Domino Pd-catalyzed oxidation-arylation reactions of secondary alcohols are also presented.