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    • 9. 发明公开
    • Process for preparing substituted 2,3-dihydrobenzofuran
    • Verfahren zur Herstellung von substitutioniertem 2,3--二氢苯并呋喃。
    • EP0127208A1
    • 1984-12-05
    • EP84200538.1
    • 1984-04-16
    • ENICHIMICA SECONDARIA S.p.A.
    • Neri, CarloGiroldini, VilliamRinaldi, AntonioTraversoni, MarioClerici, Mario
    • C07D307/86C07D307/79C07C39/15C07C37/20C07C91/42
    • C07D307/79C07C37/20C07C39/16C07D307/86
    • Preparation of substituted 2,3-dihydrobenzofuran which can be defined by the general formula:
      wherein; Ra is hydrogen, halogen, or an alkyl radical, straight lined or branched containing from 1 to 4 carbon atoms, aryl, alkaryl, -OH, -OR 3 , -N(Ra)2, (Rabeing, in its turn, an alkyl' radical, straight lined or branched containing from 1 to 4 carbon atoms);

      R b is an alkyl radical, straight lined or branched containing from 1 to 6 carbon atoms, aryl or alkaryl;
      Rc is hydrogen or has the same meaning as R b ; by rearrangement of 1,1-bis(2-hydroxybenzene)alkyl and/or aryl-ethane, which can be defined by the general formula:
      wherein Ra, R b and Rc have the above specified meanings, working in the presence of catalytic amounts of at least a mineral or an organic acidic compound, at a high temperature and withdrawing from the reaction mass the products of the rearrangement reactions they are being formed.

      The 1,1-bis(2-hydroxybenzene)alkyl and/or arylethane are obtained starting from substituted phenols and aldehydes under the influence of specially provided catalysts.
      Within the scope of this reaction, 1,1-bis(2,3-dihydroxybenzene)alkyl or aryl-methane are found, which can be defined by the general formula:
      wherein: R is an alkyl radical, straight lined or branched, containing from 1 to 20 carbon atoms, or an aryl radical;

      R 1 , R 2 and R 3 are equal to or different from each other and represent: H, halogen, or the alkyl radical, straight lined or branched, containing from 1 to 4 carbon atoms, aryl, alkaryl, -OH, -OR 4 ,-N(R 4 ) 2 , R 4 being an alkyl radical, straight lined or branched. containing from 1 to 4 carbon atoms.

      Such compounds are obtained by reaction of a biphenol which can be defined by the general formula:
      with an aldehyde which can be defined by the general formula
      wherein R, R,, R 2 and R 3 have the meanings specified hereinabove, working in the presanca of catalytic amounts of at least one compound, which is a member selected from the group consisting of oxides, hydroxides, alcoholates and carboxylates of the metals belonging to the IA, IIA, IIB and VIIB of the Periodic System of the Eiements, in the presence, or not, of a liquid and inert (i.e. nonreactive) organic solvent, the water being fowned as a reaction byproduct being optionally withdrawn as it is formed.
    • 取代的2,3-二氢苯并呋喃的制备,其可以由以下通式定义:... 其中; R a是氢,卤素或含有1至4个碳原子的直链或支链的烷基,芳基,烷芳基,-OH,OR 3 -N(R a)2(Rabeing,其又是烷基,直链 含有1至4个碳原子的内衬或支链); ... Rb是含有1-6个碳原子的直链或支链的烷基,芳基或烷芳基; Rc是氢或具有与Rb相同的含义; ...通过重排 的1,1-双(2-羟基苯)烷基和/或芳基乙烷,其可以由以下通式定义:... 其中Ra,Rb和Rc具有上述含义,在 催化量的至少一种矿物或有机酸性化合物,并在高温下从反应物质中排出它们正在形成的重排反应的产物。 在特殊提供的催化剂的影响下,从取代的酚和醛开始获得1,1-双(2-羟基苯)烷基和/或芳基乙烷。 在该反应的范围内,发现1,1-双(2,3-二羟基苯)烷基或芳基甲烷,其可以由以下通式定义:其中: R是含有1至20个碳原子的直链或支链的烷基或芳基; R1,R2和R3彼此相同或不同,表示:H,卤素或烷基, 含有1-4个碳原子的直链或支链的芳基,烷芳基,-OH,-OR4,-N(R4)2,R4是含有1-4个碳原子的直链或支链烷基。 ...这样的化合物可以通过可以由以下通式定义的联苯酚反应获得:可以由通式R-CHO ...定义的醛,其中R,R 1 R 2和 R3具有上述含义,在催化量的至少一种化合物存在下工作,所述化合物是属于IA,IIA,IIB和VIIB的金属的氧化物,氢氧化物,醇化物和碳酸甲酯的成员 在液体和惰性(即非反应性)有机溶剂的存在或不存在的情况下,作为反应副产物形成的水在其形成时任选地被抽出。