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1.
A chloro-substituted derivative was prepared from chlorophyll ′. The derivative was shown to be δ-chloro-methyl pheophorbide by UV/VIS, MS and ′H NMR. 相似文献
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All four isomers of substituted 3-alkylthio-4-hydroxybutenes have been synthesised: both the geometry of the double bond and the relative stereochemistry of the two chiral centres are controlled. 相似文献
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The synthesis of 3-vinylindoles through Wadsworth Emmons reactions with 3-formyl and 3-acylindoles is described. Although 3-formylindoles react directly with phosphonate derivatives, 3-acylindoles need prior activation by N-sulphonation. 11-5-Cyanobenzo[]carbazole has been prepared by the oxidative cycloaddition of -3-(indol-3′-yl) propenotrile and benzyne. 相似文献
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Starting from the coupling reaction of alkyl cuprates with 1-alkynyl-2-propenyl acetates, the title compounds were prepared by short convenient syntheses. 相似文献
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Claudio Fuganti Piero Grasselli Stefano Servi Carlo Zirotti 《Tetrahedron letters》1982,23(41):4269-4272
The C4erythro and threo diols (7) and (8) are converted either into the chiral epoxides (13) and (15) or into the enantiomers (14) and (16); the epoxide (13) is used as chiral synthon for the preparation of (3,4) 4-methyl-3-heptanol (21). 相似文献
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N-Acyl derivatives of ,-acosamine and ,-ristosamine were synthesized with high stereo selectivity utilizing intramolecular Michael addition of γ- and δ-carbomoyloxy-α,β-unsaturated esters. 相似文献
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J Leitich 《Tetrahedron letters》1980,21(32):3025-3028
The relative rates of formation of and [2+2]cycloadducts of benzyne to , - and , -1,5-cyclooctadiene, - and -cyclooctene are discussed and properties of the adducts (e.g., their unusual hydrogenation) are described. 相似文献
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1,3,7,9,11,12,14-Heptazapentacene-2,4,8,10 (14,3,9,12)-tetraones (mixed flavins) were prepared by the cyclization of 1,5-dihydro-8-[N-alkyl-N-(5-nitrouracil-6-yl)-amino-5-deazaflavins with Vilsmeier reagent. The mixed flavins oxidized alcohol under neutral condition in sunlight and a remarkable autorecycling was observed. 相似文献
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Palladium catalysed alkoxycarbonylation of heterocyclic halides affords a simple and versatile synthesis of both and heterocyclic esters where a range of catalysts have been studied and a method to employ inexpensive inorganic bases has been found. 相似文献
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Methods are described for the stereospecific conversion of hydrindenone 3 either to the corresponding fused or fused hydrindanone (1 or 2, respectively.) 相似文献
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A regular heteropolysaccharide built of tetrasaccharide repeating units is synthesised by means of regio- and stereospecific polycondensation of a tritylated cyanoethylidene derivative. The polysaccharide obtained is identical with the O-antigenic polysaccharides of serotypes 3b, 3c, and variant Y. It also represents the basic chain of O-antigenic polysaccharides of all serotypes of this bacterium. 相似文献
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Pinacol -1-trimethylsilyl-1-propene-3-boronate reacts with aldehydes to form (±)-(*,*)-3-trimethylsilyl-4-hydroxy-1-alkenes, which can be deoxysilylated stereoselectively to either 98% or 99% 1,3-dienes, including the separate components of the red bollworm moth pheromone. 相似文献
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