1,419 research outputs found
Pd-Promoted Cyclization of (<i>Z</i>)‑Pent-2-en-4-yn-1-yl Alkanoates Leading to Furans via an Acyl Group Shift and Further Synthetic Transformation
No full textPalladium-promoted acyl migration was observed in the
reaction
of (Z)-pent-2-en-4-yn-1-yl alkanoates in the presence
of DBU to yield 2-(alkanoylmethyl)furan derivatives (2) in high yields. Compounds 2 then underwent oxidative
decarbonylation to afford 2-acylfurans with O2 as the oxidant
under mild and metal-free conditions. The mechanistic pathway of the
reaction involving an intramolecular cyclization and acyl group shift
is discussed
Arylchlorocarbenes in the synthesis of heterocycles containing two nitrogen atoms
No full textSubstituted pyrazoles and pyrrolo[1,2-c]pyrimidines were prepared from the reaction of arylchlorocarbenes with 1,2-diazabuta-1,3-dienes and 4-vinylpyrimidines, respectively.PT: J; CR: ATTANASI A, 1998, J ORG CHEM, V63, P9880 ATTANASI OA, 1977, SYNLETT, P1128 ATTANASI OA, 1999, TETRAHEDRON LETT, V40, P3891 BONINI BF, 1981, J CHEM SOC P1, P2322 BONNEAU R, 1999, J PHOTOCH PHOTOBIO A, V126, P31 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 KUEHNE ME, 1964, J ORG CHEM, V29, P1582 LIU MTH, 1994, INT J CHEM KINET, V26, P1179 MAIBORODA DA, 1997, J ORG CHEM, V62, P7100 MINGUEZ JM, 1996, J ORG CHEM, V61, P4655 MOYANO EL, 1998, J ORG CHEM, V63, P8188 OVERBERGER CG, 1954, J AM CHEM SOC, V76, P1879 PERKAMPUS HH, 1972, TETRAHEDRON, V28, P2099 ROMASHIN YN, 1999, CHEM COMMUN 0307, P447 ROMASHIN YN, 1999, TETRAHEDRON LETT, V40, P7163 WONG JL, 1965, J ORG CHEM, V30, P2398; NR: 16; TC: 6; J9: CHEM COMMUN; PG: 2; GA: 324XFSource type: Electronic(1
Iron-Catalyzed Synthesis of Benzosultams from <i>N</i>‑Phenyl‑<i>N</i>‑(prop-2-yn-1-yl)benzenesulfonamide and Benzenesulfonyl Hydrazine
No full textA novel route for an iron-catalyzed tandem sulfonylation,
C(sp2)–H activation, cyclization reaction which
uses N-phenyl-N-(prop-2-yn-1-yl)benzenesulfonamide
and benzenesulfonohydrazide to synthesize derivatives of (Z)-2-phenyl-4-((phenylsulfonyl)methylene)-3,4-dihydro-2H-benzo[e][1,2]thiazine 1,1-dioxide has
been developed. The method features convenient operation and good
functional group tolerance. In addition, it employs insensitive and
inexpensive FeSO4 as the catalyst and provides a direct
approach for the preparation of benzothiazides
Growth temperature effect on the optical and material properties of AlxInyGa1-x-yN epilayers grown by MOCVD
No full textAlxInyGa1-x-yN epilayers have been grown by metalorganic chemical vapor deposition (MOCVD) at different temperatures from 800 to 870degreesC. The incorporation of indium is found to increase with decreasing growth temperature, while the incorporation of Al remains nearly constant. The optical properties of the samples have been investigated by photoluminescence (PL) and time-resolved photoluminescence (TRPL) at different temperatures. The results show that the sample grown at 820 C exhibits the best optical quality for its large PL intensity and the absence of the yellow luminescence. Furthermore the temperature-dependent PL and TRPL of the sample reveals its less exciton localization effect caused by alloy fluctuations. In the scanning electron microscopy measurement, much uniform surface morphology is found for the sample grown at 820degreesC, in good agreement with the PL results, The improvement of AlxInyGa1-x-yN quality is well correlated with the incorporation of indium into AlGaN and the possible mechanism is discussed. (C) 2002 Elsevier Science B.V. All rights reserved
The indazole derivative YD-3 inhibits thrombin-induced vascular smooth muscle cell proliferation and attenuates intimal thickening after balloon injury.
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