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排序方式: 共有113条查询结果,搜索用时 31 毫秒
1.
Dmitry V. Moiseev Vera A. Morugova Andrey S. Shavirin Victor A. Dodonov 《Journal of organometallic chemistry》2004,689(4):731-737
Tetraphenylantimony(V) carboxylates have been used in the palladium-catalyzed C-phenylation reaction of methyl acrylate in the presence of (PhCO2)2 or t-BuOOH under mild conditions (50 °C). The peroxides promote a cascade participation of the organoantimony compound and result in the transfer of three phenyl groups. Organoantimony intermediates have been isolated from the reaction. 相似文献
2.
Ronald W. Clawson Jr. 《Tetrahedron letters》2007,48(34):6019-6021
An expedient synthesis of the alkaloid koniamborine, the only to date isolated naturally occurring pyrano[3,2-b]indole is presented. The key pyrano[3,2-b]indole forming step is a palladium-catalyzed reductive N-heteroannulation of 2-(4-methoxy-2-nitrophenyl)-(4H)-pyrane-4-one. 相似文献
3.
Laurel A. Goj 《Journal of organometallic chemistry》2003,687(2):498-507
Cycloisomerization of 4,4-bis(acetoxymethyl)-1,6-heptadiene (5) catalyzed by [(phen)Pd(Me)CNCH3]+ [BAr4]− [Ar=3,5-C6H3(CF3)2] (2) to form predominantly 3,3-bis(acetoxymethyl)-1,5-dimethylcyclopentene (6) was ∼400 times faster than was the cycloisomerization of dimethyl diallylmalonate (1) under identical conditions. Mechanistic studies performed in conjunction with density functional theory calculations attribute the large rate acceleration of the cycloisomerization of 5 relative to the cycloisomerization of 1 to the formation of a stable oxo chelate complex as an intermediate in the cycloisomerization of 1, but not in the cycloisomerization of 5. 相似文献
4.
钯催化下有机锡化合物的偶联反应在碳-碳键形成过程中的应用 总被引:2,自引:0,他引:2
本文述评了最近几年来钯催化的有机锡化合物与有机亲电试剂的交叉偶联反应在有机合成中用于碳-碳键形成的主要研究成果。主要讨论了直接交叉偶联反应,CO或烯键插入的交叉偶联反应和机理。 相似文献
5.
Mingxing Qian 《Tetrahedron letters》2005,46(16):2927-2930
The reaction of alkynylzinc bromides with benzyl bromides or chlorides in the presence of a catalytic amount of Pd(DPEphos)Cl2 in THF at 23 °C cleanly produces the corresponding benzylated alkynes in 73-97% yields. With 10−3 mol % of Pd(DPEphos)Cl2, the maximum turnover number of 7.1 × 104 has been observed for the formation of PhCCCH2Ph. 相似文献
6.
Zhende Liu 《Tetrahedron》2007,63(9):1931-1936
A flexible method for the synthesis of 5,6-disubstituted furo[2,3-d]pyrimidine derivatives is described. The key step is a palladium-catalyzed arylative cyclization of alkynylpyrimidinols with various aryl iodides, which gave the title compounds in 36-75% yield. 相似文献
7.
Björn C.G. Söderberg Jeremiah W. Hubbard Stacey R. Rector Shannon N. O'Neil 《Tetrahedron》2005,61(15):3637-3649
A route to 3,4-fused indoles via two consecutive palladium-catalyzed reactions; an intramolecular Heck reaction followed by a reductive N-heteroannulation is described. Using this route, a number of indoles have been prepared having a variety of ring sizes anchored to the 3- and 4-position of the indole nucleus. Furthermore, a number of functional groups, both carbon and heteroatom substituents can be introduced in (and on) the additional ring without any detrimental effects on the two reactions. 相似文献
8.
A Pd-catalyzed haloallylation of alkynes with allyl alcohols in ionic liquids has been reported. Both chloroallylation and bromoallylation can be easily carried out with high selectivity. A variety of 1,4-dienes were formed in moderate to excellent yields. The reaction system of the Pd catalyst as well as the ionic liquid can be recycled for several times. And the ionic liquid acts as not only a solvent in the reaction, but also provides the excess halide ions to control Z/E selectivity and acts as a ligand inhibit the β-hydride elimination. 相似文献
9.
Trisubstituted thiazoles were synthesized with excellent yields using ligand-free, palladium-catalyzed, direct 5-arylation of 2,4-disubstituted thiazole and conventional or microwave-assisted heating. The palladium-catalyzed reaction yields were significantly influenced by LiCl additive, solvent, and heating method. The reaction times were reduced dramatically by employing microwave radiation instead of conventional heating. The synthetic methods can be applied to diverse 2,4,5-trisubstituted thiazoles by varying the aryl bromide and disubstituted thiazole reactants. 相似文献
10.