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Autor:
Toshihiro Watanabe, Yoshitaka Koseki, Shigenobu Aoyagi, Masato Suzuki, Hitoshi Kasai, Takaaki Kamishima
Publikováno v:
Tetrahedron Letters. 60(20):1375-1378
This study reported a stereoselective synthesis of (+)/(+)-pentenomycin I in 4–5 steps through regioselective silylation, optical resolution and dihydroxylation, followed by an olefin formation, from a known racemic cyclopentenone prepared from 2-d
Publikováno v:
Tetrahedron Letters. 60(7):570-573
We developed an environmentally friendly method for aerobic oxidation of alcohols using a commercially available, relatively benign bismuth salt as a catalyst. We found that the catalytic combination of BiBr3 with nitric acid is key for enhancing the
Autor:
Fumihiro Kumazawa, Shunsuke Mori, Tetsuo Narumi, Nobuyuki Mase, Kohei Sato, Jun Ishizuka, Moniruzzaman, Shoji Yamamoto
Publikováno v:
Tetrahedron Letters. 59(50):4392-4396
The synthesis of poly- l -lactide (PLLA) in supercritical carbon dioxide (scCO2) was accomplished using an organocatalyst. The reaction proceeded smoothly under CO2 plasticizing polymerization (CPP) conditions at a lower temperature than those conven
Autor:
Sherman, David H., Williams, Robert M., Aika, Kai, Hikaru, Kato, David H., Sherman, Robert M. , Williams, Sachiko, Tsukamoto
Publikováno v:
Tetrahedron Letters. 59(48):4236-4240
A new prenylated indoxyl alkaloid, Amoenamide B (1), was isolated from Aspergillus amoenus NRRL 35600 along with Asperochramide A (2). Although many prenylated oxyindole alkaloids, containing bicyclo[2.2.2]diazaoctane cores, have been isolated from t
Publikováno v:
Tetrahedron letters. 59(47):4149-4152
A series of phenanthrene-fused N2O-type boron-dipyrrin complexes (BODIPYs) with various substituents were synthesized. The synthesized BODIPYs show light absorption and emission in the red to near-infrared region due to their extended π-system. Furt
Autor:
Masaki Tsukamoto, Kin-ichi Oyama
Publikováno v:
Tetrahedron Letters. 59(26):2477-2484
Acidic 1,3-azolium salts are prepared from Brønsted acids and 1,3-azoles such as imidazole, thiazole, and oxazole. Acidic imidazolium salts are frequently employed as promoters for the synthesis of nucleotides using the phosphoramidite method in a s
Publikováno v:
Tetrahedron Letters. 59(23):2268-2271
The selective protonation of aromatic hydrocarbons with at least two or more aromatic rings and aromatic compounds bearing unsaturated linkages can be achieved by metallic strontium metal with ammonium chloride and iodine, or ammonium iodide in tetra
Publikováno v:
Tetrahedron Letters. 58(34):3337-3340
A substitution reaction of 4-nitrofuroxans to prepare 4-cyanofuroxans is described. This substitution reaction was complicated by the reverse reaction and a judicious choice of cyanide source was important to enable this direct synthesis process. The
Publikováno v:
Tetrahedron Letters. 73:153107
The original flavopeptide catalyst, 3-FlC2- l -Pro- l -Tyr- l -Asp-Ado-NH-PS (Fl-PepLLL), and its diastereomers including Fl-PepDDL, Fl-PepLDL, and Fl-PepDLL were synthesized to investigate the correlation between their catalytic activity and stereoc
Publikováno v:
Tetrahedron Letters. 58(20):1921-1924
A solid-supported acidic oxazolium perchlorate was investigated as a heterogeneous catalyst in N-glycosylation reactions using silylated modified pyrimidines and an acylated ribose or glucose to afford the corresponding pyrimidine nucleosides. This s