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7,9-Bisdeoxycarminomycinone has been synthesised from 5-hydroxyquinizarin by two annelation routes involving nitronate addition to C-2 and aldol condensation at C-3. 4-Demethoxy-7,9-bisdeoxydaunomycinone has been synthesised efficiently by similar methods. 相似文献
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Zinniol 10, 3 - methoxy - 4 -methyl - 5 (3 - methyl - 2 - butenyloxy) - 1,2 - benzenedimethanol, a metabolite isolated from the pathogenic fungus Alternaria zinniae, has been synthesised. 相似文献
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Metacycloprodigiosin 1, a tripyrrole pigment isolated from Streptomyces longisporus ruber, has been synthesized by condensation of the meta-fused pyrrole 2, prepared from cyclododecanone, with the known methoxybipyrrole aldehyde precursor 3. 相似文献
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Summary The synthesis of vinylpyrrolidone from succinic acid was accomplished without the use of acetylene or increased pressure. 相似文献
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《Tetrahedron》1986,42(6):1621-1631
The first synthesis of pentaprismane, hexacyclo[4.4.0.02,5.03,9.04,8.07,10]decane, is presented with full experimental details. A new and practical synthesis for homopentaprismanone is developed as is methodology for the functionalization of a bridgehead position α to the carbonyl group of this cage compound. The latter uses a mixed acyloin reductive coupling. Favorakii contraction of the bridgehead functionalized homopentaprismanone is employed to enter the pentaprismane ring system. A brief discussion is given of th́e geometry of pentaprismane, of its behavior relative to cubane, and of the future of prismane chemistry. 相似文献
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Hirotaka Kudo Marvin L. Tedjamulia Raymond N. Castle Milton L. Lee 《Journal of heterocyclic chemistry》1984,21(6):1833-1839
The synthesis of phenanthro[1,2-c]dibenzothiophene (6) , phenanthro[4,3-c]dibenzothiophene (10) , phenanthro[2,1-a]dibenzothiophene (14) , phenanthro[3,4-a]dibenzothiophene (16) , phenanthro[1,2-a]dibenzothiophene (19) , phenanthro[2,1-b]dibenzothiophene (20) , 8-methylphenanthro[3,2-a]dibenzothiophene (24) , 7-methylphenanthro[1,2-a]dibenzothiophene (25) , phenanthro[3,4-a]dibenzothiophene (27) , phenanthro[4,3-a]-dibenzothiophene (28) , 6-methylphenanthro[2,3-a]dibenzothiophene (31) , and 5-methylphenanthro[4,3-a]dibenzothiophene (32) is described. 相似文献
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Belén Abarca Rafael Ballesteros Gurnos Jones 《Journal of heterocyclic chemistry》1984,21(6):1585-1588
A synthesis of the methylthieno[3,2-c]cyclohepteno[b]indole 7 from 2-methylthieno[3,2-b]cycloheptanone 3 is described. Unsuccessful attempts to prepare the isomeric thienocycloheptenoindole system present in formula 2 , from the dihydrobenzothiophenone 8 , and from derivatives of 5-(2-thienyl)-4-oxopentanoic acid, 17 and 18 , and from N-benzylcycloheptindol-1-one 22 were unsuccessful. The preparation of 4,5-dihydro-2-phenyl-1-thienylmethyl-3H-pyridazin-3-one 20 and of the 5-aminopyrazole 21 are reported. 相似文献
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The structure of berberastine iodide (1a) has been confirmed by a synthesis of its racemate. The key intermediate is the 7,8-dimethoxy-3-arylisoquinoline derivative (3a) and several methods for its formation were studied. 相似文献