[EN] TROPOLONE DERIVATIVES AND TAUTOMERS THEREOF FOR IRON REGULATION IN ANIMALS [FR] DÉRIVÉS DE TROPOLONE ET LEURS TAUTOMÈRES POUR LA RÉGULATION DU FER CHEZ LES ANIMAUX
Lewis-acid promoted rearrangement of σ-homo-o-benzoquinones to α-tropolone derivatives: application to regiocontrolled syntheses of MY3-469 and isopygmaein
作者:Martin G. Banwell、Maree P. Collis
DOI:10.1039/c39910001343
日期:——
Reaction of various σ-homo-o-benzoquinones, e. g.42, with BF3·Et2O results in the formation of the tropolonoboron difluoride derivatives, e. g.43, of the isomeric α-tropolones, e.g. isopygmaein 33.
Palladium-Catalyzed Vinylation of Haloazulenes and Halotropolones with Olefins. Utility of the Heck Reaction in the Conjugated Carbon Chain Preparation
作者:Hiroshi Horino、Toyonobu Asao、Naoto Inoue
DOI:10.1246/bcsj.64.183
日期:1991.1
The reactions of 3-iodotropolone with styrenes (styrene, p-methoxystyrene, and 2-vinylpyridine), methyl acrylate, and allylic compounds (methyl 3-butenoate, 3-butenenitrile, 1-allyl-3,4-dimethoxybenzene, and 1-allyl-3,4-methylenedioxybenzene) were carried out, according to the modified Heck’s procedure, to give 3-styryl-, 3-(2-carboxyvinyl)-, and 3-(3-substituted 1-propenyl)tropolones, respectively. Similarly, 4-bromo- or 5-bromotropolone was made to react with these olefins to yield 4-styryltropolone or the corresponding 5-(2-substituted vinyl)- and 5-(3-substituted 1-propenyl)tropolones. Substitution of 2-chlorotropone by styrenes produced 2-styryltropones. Extension of the vinylation to 2-amino-6-bromoazulenes, ethyl 3-bromo-1-azulenecarboxylate, and diethyl 2-chloro-1,3-azulenedicarboxylate resulted in a similar substitution.
A versatile new strategy for the synthesis of tropolones
作者:Martin G. Banwell、René Onrust
DOI:10.1016/s0040-4039(00)88954-6
日期:1985.1
Swern-type oxidation of various 7-halogenobicyclo[4.1.0]heptane-2,3- or -3,4-diols affords the corresponding bicyclic diketones which undergo in situ ring expansion and loss of hydrogen halide to give α-tropolones in high yield. The quantitative conversion of the isolable 1,4-diketone 26 into the γ-tropolone acetate 27 has been achieved.
Vinylic substitution on troponoid catalyzed by palladium complexes, and formation of new C-pd σ-complexes of troponoid
作者:Hiroshi Horino、Naoto Inoue、Toyonobu Asao
DOI:10.1016/0040-4039(81)80139-6
日期:1981.1
The reaction of 3-, 4- and 5-halotropolones with olefins catalyzed by palladium (O) complex gave 3-, 4- and 5-(substitutedvinyl) tropolones respectively. Similarly, 2-chlorotropone gave 2-styryltropones. Some tropolonyl- and troponylpalladium-σ-complexes were synthesized.