共查询到20条相似文献,搜索用时 15 毫秒
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Tatsuro Ouchi Satoshi Jokei Hidenori Chikashita 《Journal of heterocyclic chemistry》1982,19(4):935-936
1,2:5,6-Di-O-isopropylidene-3-O-[3-(uracil-1-yl)propionoyl]-α-D-glucofuranose and 1,2-mono-O-isopropylidene-6-O-[3-(uracil-1-yl)propionoyl]-α-D-glucofuranose were synthesized. 相似文献
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Roy L. Whistler Paul A. Seib 《Journal of polymer science. Part A, Polymer chemistry》1966,4(5):1261-1275
A new method for preparing D -glucose polymers is described. Isopropylidene derivatives of D -glucofuranose, particularly the 1,2-mono-O-derivative, are treated with Lewis acids, such as boron trifluoride, to eliminate acetone and produce a highly branched polymer with a molecular weight of 12,700. Approximately one isopropylidene unit remains, possibly on the potential reducing end of the glucan. Up to 95% of the polymer units are D-glucopyranoside units indicating that ring expansion occurs during the condensation. 相似文献
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A 3:1 mixture of (+)-(2S, 6S)-trans-α-irone ((+)-1) and (?)-(2S, 6S)-trans-γ-irone (?)-2) has been synthesized with ca. 70% e. e. by the ene reaction of (?)-(S)-3 and but-3-yn-2-one. 相似文献
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Marc Lang Ernst Hungerbühler Peter Schneider Riccardo Scartazzini Werner Tosch Edward A. Konopka Oto Zak 《Helvetica chimica acta》1986,69(7):1576-1580
In continuation of our work on penem antibiotics, novel chiral (5R,6S)-2-(1′-aminoalkyl)-6-(hydroxyalkyl)-derivatives 1 have been synthesized by two essentially different strategies. Whereas the starting materials for 1a - f , azetidinones 2 and 5 , were obtained from chiral building blocks (6-aminopenicillanic acid and L-threonine, resp.), the one for 1g , azetidinone 9 , was derived from racemic 4-acetoxyazetidinone and, as chiral auxiliary, (2R)-2-mercaptopropan-1-ol. The 2-aminomethyl derivatives 1a (CGP 30 779) and 1f (CGP 31 608) proved the most potent compounds in the antibacterial tests in vitro and showed a well-balanced spectrum of activity by comparison with that of established β-lactams. 相似文献
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Synthesis of 1,2-O-(1-cyanoethylidene)-3,6,2′,3′,4′-penta-O-acetyl-6′-O-trityl-4-O-α-D-glucopyranose
Conclusions We have synthesized 1,2-O-(1-cyanoethylidene)-3,6,2, 3,4-penta-O-acetyl-6-O-trityl-4-O--D-glucopyranosyl--D-glucopyranose, which is a potential monomer for polycondensation.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2571–2573, November, 1977. 相似文献