Studies on the reaction of .PI.-deficient heterocycles with aromatic aldehyde in the presence of cyanide ion.
作者:TAKEO HIGASHINO、MASAMI GOI、EISAKU HAYASHI
DOI:10.1248/cpb.24.238
日期:——
Dimerization of π-deficient heterocyles by the catalytic action of cyanide ion in DMSO was carried out. Thus, reaction of quinoxaline (V), 1-phenyl-1H-pyrazolo [3, 4-d] pyrimidine (VI), 1-methyl-1H-pyrazolo [3, 4-d] pyrimidine (VII), and pyrido [2, 3-b] pyrazine (VIII) with cyanide ion gave 2, 2'-biquinoxaline (IX), 4.4'-bis [1-phenyl-1H-pyrazolo [3, 4-d] pyrimidine] (X), 4, 4'-bis [1-methyl-1H-pyrazolo [3, 4-d] pyrimidine] (XI), and 2, 2'-bipyrido [2, 3-b] pyrazine (XII), respectively, although the yields of these dimers were very poor. The formation of dimer is assumed to be oxidation following a benzoin condensation-like reaction by the catalysis of cyanide ion. Also we carried out the reaction of π-deficient heterocycles with aromatic aldehyde (XVI) in the presence of cyanide ion in DMSO, and found that the expected cross benzoin condensation-like reaction has developed. Thus, 4-isoquinolinecarbonitrile (II) reacted with XVI to give α-aryl-4-cyano-1-isoquinolinemethanol (XIX) and aryl 4-cyano-1-isoquinolyl ketone (XX) together with 1, 1'-biisoquinoline-4, 4'-dicarbonitrile (IV). Similarly, V and XVI gave α-aryl-2-quinoxalinemethanol (XXI) and aryl 2-quinoxalinyl ketone (XXII), VI and XVI afforded α-aryl-1-phenyl-1H-pyrazolo [3, 4-d] pyrimidine-4-methanol (XXX) and aryl 1-phenyl-1H-pyrazolo [3, 4-d] pyrimidin-4-yl ketone (XXXI), VII and XVI produced α-aryl-1-methyl-1H-pyrazolo [3, 4-d] pyrimidine-4-methanol (XXXIV) and aryl 1-methyl-1H-pyrazolo [3, 4-d] pyrimidin-4-yl ketone (XXXV), and VIII and XVI formed aryl 2-pyrido [2, 3-b] pyrazinyl ketone (XXXIV). It seems that XIX, XXI, XXX, and XXXIV are a formal product of a cross benzoin condensation-like reaction, and XX, XXII, XXXI, XXXV, and XXXVI are oxidation product of a formal product of the reaction. And limitation of this reaction was also discussed.
在DMSO中,通过氰离子的催化作用进行了π缺乏杂环的二聚反应。因此,喹喔啉(V)、1-苯基-1H-吡唑[3, 4-d]嘧啶(VI)、1-甲基-1H-吡唑[3, 4-d]嘧啶(VII)和吡啶[2, 3-b]嘧啶(VIII)与氰离子的反应分别生成了2, 2'-双喹喔啉(IX)、4, 4'-双[1-苯基-1H-吡唑[3, 4-d]嘧啶](X)、4, 4'-双[1-甲基-1H-吡唑[3, 4-d]嘧啶](XI)和2, 2'-双吡啶[2, 3-b]嘧啶(XII),尽管这些二聚体的产率非常低。假定二聚体的形成是氰离子催化下通过类似苯醇缩合反应的氧化反应。此外,我们还在氰离子的存在下,使用DMSO进行了π缺乏杂环与香豆醛(XVI)的反应,并发现预期的交叉苯醇缩合似反应得以进行。因此,4-异喹啉腈(II)与XVI反应生成α-芳基-4-氰-1-异喹啉甲醇(XIX)和芳基4-氰-1-异喹啉酮(XX),以及1, 1'-双异喹啉-4, 4'-二腈(IV)。类似地,V与XVI反应生成α-芳基-2-喹喔啉甲醇(XXI)和芳基2-喹喔啉酮(XXII),VI与XVI生成α-芳基-1-苯基-1H-吡唑[3, 4-d]嘧啶-4-甲醇(XXX)和芳基1-苯基-1H-吡唑[3, 4-d]嘧啶-4-酮(XXXI),VII与XVI生成α-芳基-1-甲基-1H-吡唑[3, 4-d]嘧啶-4-甲醇(XXXIV)和芳基1-甲基-1H-吡唑[3, 4-d]嘧啶-4-酮(XXXV),而VIII与XVI生成芳基2-吡啶[2, 3-b]嘧啶酮(XXXVI)。看起来XIX、XXI、XXX和XXXIV是交叉苯醇缩合类似反应的形式产物,而XX、XXII、XXXI、XXXV和XXXVI是该反应形式产物的氧化产物。同时还讨论了该反应的局限性。