Fourteen unreported 2-amino-4H-imidazol-4-ones 4 were rapidly synthesized by a new parallel synthetic method, which included aza-Wittig reaction of iminophosphorane 1 with phenyl isocynate to give carbodiimide 2 and s...Fourteen unreported 2-amino-4H-imidazol-4-ones 4 were rapidly synthesized by a new parallel synthetic method, which included aza-Wittig reaction of iminophosphorane 1 with phenyl isocynate to give carbodiimide 2 and subsequent reaction of 2 with various amines in a parallel fashion. The structure of compound 4 was confirmed by means of 1H NMR, MS and IR. The configuration of compound 4b was determined as in Z form since the coupling constant 3J( 13C, 1H) between the carbonyl carbon and the olefinic hydrogen was 5.6 Hz.展开更多
A series of 2 amino 3 cyano 4 aryl 4H benzochromenes were synehesized by the reaction of malononitrile and 1 naphthol with corresponding aromatic aldehydes in ethanol in the presence of piperidine as catalyst. The str...A series of 2 amino 3 cyano 4 aryl 4H benzochromenes were synehesized by the reaction of malononitrile and 1 naphthol with corresponding aromatic aldehydes in ethanol in the presence of piperidine as catalyst. The structures of all compounds obtained were characterized by elemental analysis, IR, 1H NMR and single crystal X ray diffractometry. X ray crystal structure analysis indicates compound 4b crystallizes in monoclinic, with space group C2/c, a = 2 422 1(6) nm , b = 0 901 6(2) nm , c = 1 700 3(5) nm , β =93 16(1)°, V = 3 707 4(15) nm 3 , Z =8, D c= 1 284 g/cm 3 , I≥2σ(I) =2 141, R = 0 043 2 , wR = 0 108 5 . Compared to other methods, this method has the advantages of simple operation and good yields.展开更多
A series of 2 amimo 3 cyano 7,7 dimethyl 4 aryl 5 oxo 5,6,7,8 tetra 4H chromenes were synthesized in the absence of catalyst. Their structures were determined by IR, 1H NMR, and single crystal X ray diffraction.
文摘Fourteen unreported 2-amino-4H-imidazol-4-ones 4 were rapidly synthesized by a new parallel synthetic method, which included aza-Wittig reaction of iminophosphorane 1 with phenyl isocynate to give carbodiimide 2 and subsequent reaction of 2 with various amines in a parallel fashion. The structure of compound 4 was confirmed by means of 1H NMR, MS and IR. The configuration of compound 4b was determined as in Z form since the coupling constant 3J( 13C, 1H) between the carbonyl carbon and the olefinic hydrogen was 5.6 Hz.
文摘A series of 2 amino 3 cyano 4 aryl 4H benzochromenes were synehesized by the reaction of malononitrile and 1 naphthol with corresponding aromatic aldehydes in ethanol in the presence of piperidine as catalyst. The structures of all compounds obtained were characterized by elemental analysis, IR, 1H NMR and single crystal X ray diffractometry. X ray crystal structure analysis indicates compound 4b crystallizes in monoclinic, with space group C2/c, a = 2 422 1(6) nm , b = 0 901 6(2) nm , c = 1 700 3(5) nm , β =93 16(1)°, V = 3 707 4(15) nm 3 , Z =8, D c= 1 284 g/cm 3 , I≥2σ(I) =2 141, R = 0 043 2 , wR = 0 108 5 . Compared to other methods, this method has the advantages of simple operation and good yields.
文摘A series of 2 amimo 3 cyano 7,7 dimethyl 4 aryl 5 oxo 5,6,7,8 tetra 4H chromenes were synthesized in the absence of catalyst. Their structures were determined by IR, 1H NMR, and single crystal X ray diffraction.
