通过各自的3-芳基-4-乙氧基羰基呋喃(3a)的脱甲基环化反应,合成了各种1,3-二甲基和1-甲基-3-苯基呋喃[3,4- c ]香豆素(5a-h和6a-h)。-h和4a-h)。这些乙氧基羰基呋喃是通过使适当的1-芳基-2-硝基-丙-1-烯(1a-h)与乙酰乙酸乙酯或苯甲酰基乙酸乙酯在Nef反应条件下反应制备的。
Direct Palladium-Catalyzed C-4 Arylation of Tri-substituted Furans with Aryl Chlorides: An Efficient Access to Heteroaromatics
作者:Hai Yang、Zhishuo Zheng、Jian Zeng、Huajie Liu、Bing Yi
DOI:10.5012/bkcs.2012.33.8.2623
日期:2012.8.20
A series of functionalized furans were synthesized by way of a palladium -catalyzed coupling reaction of 2,3,5trisubstituted furans with aryl chlorides through C-H bond cleavages at C-4position. The feature of the reaction was facilitative preparation of furan derivatives with good functional group tolerance. All reactions gave the desired products in moderate to good yields in the presences of BuAd2P
通过钯催化的2,3,5三取代呋喃与芳基氯通过C-4位CH键断裂的偶联反应合成了一系列功能化呋喃。该反应的特点是便于制备具有良好官能团耐受性的呋喃衍生物。在 BuAd2P 和 t-BuOK 的存在下,在 DMF 中 120 o C 15 小时后,所有反应均以中等至良好的收率得到所需产物。
A Novel Propargylation/Cycloisomerization Tandem Process Catalyzed by a Ruthenium(II)/Trifluoroacetic Acid System: One-Pot Entry to Fully Substituted Furans from Readily Available Secondary Propargylic Alcohols and 1,3-Dicarbonyl Compounds
作者:Victorio Cadierno、José Gimeno、Noel Nebra
DOI:10.1002/adsc.200600366
日期:2007.2.5
and highly efficient method for the preparation of tetrasubstituted furans starting from readily accessible propargylic alcohols and commercially available 1,3-dicarbonylcompounds has been developed. The process, which proceeds in a one-pot manner, involves the initial propargylation of the 1,3-dicarbonylcompound promoted by trifluoroacetic acid, and subsequent cycloisomerization of the resulting
作者:Dinker I. Brahmbhatt、Jitendra M. Gajera、Chirag N. Patel、Vishwesh P. Pandya、Urvish R. Pandya
DOI:10.1002/jhet.5570430643
日期:2006.11
Various 1,3-dimethyl and 1-methyl-3-phenylfuro[3,4-c]coumarins (5a-h and 6a-h) have been synthesized by demethylation cyclization of the respective 3-aryl-4-ethoxycarbonyl furans (3a-h and 4a-h). These ethoxycarbonyl furans were prepared by reacting appropriate 1-aryl-2-nitro-prop-1-ene (1a-h) with ethyl acetoacetate or ethyl benzoylacetate under Nef reaction condition.
通过各自的3-芳基-4-乙氧基羰基呋喃(3a)的脱甲基环化反应,合成了各种1,3-二甲基和1-甲基-3-苯基呋喃[3,4- c ]香豆素(5a-h和6a-h)。-h和4a-h)。这些乙氧基羰基呋喃是通过使适当的1-芳基-2-硝基-丙-1-烯(1a-h)与乙酰乙酸乙酯或苯甲酰基乙酸乙酯在Nef反应条件下反应制备的。
Gold(I)-Catalyzed Synthesis of Highly Substituted Furans
作者:Michael H. Suhre、Michael Reif、Stefan F. Kirsch
DOI:10.1021/ol0514101
日期:2005.9.1
triphenylphosphinegold(I) complexes are excellent catalysts for a cascade reaction of propargyl-Claisen rearrangement and heterocyclization to synthesize tri- and tetrasubstituted furans. Starting from easily accessed propargyl vinyl ethers, the furans are obtained in 72-99% yield. [reaction: see text]