共查询到20条相似文献,搜索用时 15 毫秒
1.
The reaction of n-Bul, i with phthalic anhydride derivatives leads to (Z)-3-butylidenephthalide derivatives. 相似文献
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Ming Zhong CAI* Chun Yun PENG Jia Di HUANG Department of Chemistry Jiangxi Normal University Nanchang 《中国化学快报》2002,(12)
Many biologically active compounds occurring in nature possess the structural skeleton of trisubstituted alkenes1-3. Difunctional group reagents, which have two different functional groups linked to the olefinic carbon atoms, for example, Se-Zr, Se-B, Se-Sn play important roles in organic synthesis, especially in developing a lot of convenient methods for stereoselective synthesis of substituted alkenes4. Recently, Tingoli et al.5 reported that (Z)-a-selanylvinyl p-toluenesulfonates can u… 相似文献
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Guang Yu XU Yi ZHOU Man Cai XU 《中国化学快报》2006,17(3):302-304
Oxazolidinones as a new class of synthetic antimicrobial agents are active against numerous multidrug-resistant Gram-positive organisms1. Linezolid 1 as the promising candidate of this family works effectively against numerous serious Gram-positive human … 相似文献
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Vinyl esters of dithiocarbamic acids have been stereospecifically prepared by the reaction of sodium dithiocarbamates with vinyi(phenyi)iodonium tetrafluoroborates with retention or inversion of the configurations. 相似文献
5.
(Z)-α-Selanyl alkenyl Grignard reagents 2 were prepared conveniently by treatment of (-bromovinylselenides 1 with magnesium filings in THF. Intermediates 2 were reacted with alkyl iodides in the presence of CuI or Pd(PPh3)4 to afford (Z)-1,2-disubstituted vinylselenides 3, which were cross-coupled with Grignard reagents in the presence of (PPh3)2NiCl2 to give trisubstituted alkenes 4 stereoselectively in good yields. 相似文献
6.
The quantitative and fully stereoselective synthesis of (Z)-perfluoroalkyl-1-iodo-1-triisopropylsilylalkenes and their easy, high-yielding transformation into the corresponding 1-iodo-2-perfluoroacetylenes and (Z)-2-perfluoroalkyl-1-iodo-1-alkenes, compounds of interest as synthons for classical organometallic chemistry or for metal-catalyzed coupling reactions, are discussed. 相似文献
7.
In asymmetric catalysis, chiral (central chiral, planar chiral, axial chiral) ferrocenylligands is one of the most successful class of auxiliaries in recent years, and some ofthem have reached the stage of industrial applications'. But many challenges remain forthe synthesis of the intermediate. One of them is how to get ferrocenylcyanide I directlyfrom ferrocenecarboxyaldehyde 2, which can be easily prepared according to thecorresponding literature2. As far as known, I is an important interm… 相似文献
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In 1977 Tamaki1 et al have isolated and synthesized2 (Z)-7-nonadecen-ll-one (la) and (Z)-7-eicosen-l1-one (1b) which are active components of the female sex pheromones of the peach fruit moth Carposina niponensis Walsingham, a major economic pest of apple, peach and other fruits of Japan. We report in this communication a practical, convenient and stereospecific route to 1a and 1b. 相似文献
9.
Michelle Galgoci Janel E. Davidson Clinton K. Harrington Dennis L. Hasha Christian T. Goralski 《合成通讯》2013,43(17):2477-2483
A simple method for the preparation of the title compounds via the reaction of dimethyl 2-ethenylcyclopropane-1,1-dicarboxylate with 6M ammonia in methanol is described. 相似文献
10.
BinFU DaMingDU QingXIA 《中国化学快报》2004,15(4):383-385
The synthesis of bis(oxazoline) dicarboxylate derivatives was investigated.Diethyl-aminosulfur trifluoride (DAST) was used as a convenient cyclization reagent in the synthesis of bis(oxazoline) dicarboxylate derivatives,which can not be obtained by the general method using MsC1 and Et3N as dehydrating cyclization reagent. 相似文献
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Wei-Feng Wang Dr. Jin-Bao Peng Dr. Xinxin Qi Dr. Jun Ying Prof. Dr. Xiao-Feng Wu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(14):3521-3524
A convenient palladium-catalyzed carbonylation reaction for the efficient synthesis of (E)-3-benzylidenechroman-4-ones has been developed. Using TFBen as a solid CO source, a range of substituted (E)-3-benzylidenechroman-4-ones were prepared in moderate to good yields with 2-iodophenols and allyl chlorides as the substrates. Additionally, substituted quinolin-4(1H)-ones can also be obtained with 2-iodoaniline as the starting material. 相似文献
14.
(Z)-3-Butylidene-4-hydroxyphthalide (5) was first synthesized regio- and stereoselectively from 3-methoxybenzyl alcohol (1) 相似文献
15.
Daniel F. Brayton Karen I. Goldberg Werner Kaminsky D. Michael Heinekey 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):2534-2540
A convenient one-pot synthesis of (t-Bu)2P(O)Cl (1) from m-chloroperbenzoic acid and (t-Bu)2PCl is described. The byproduct m-chlorobenzoic acid is neutralized by addition of Et3N. Complex 1 crystallizes in the monoclinic space group P21/c (No. 14), with a = 5.9637(2) Å, b = 11.4734(4) Å, c = 16.2400(5) Å and β = 107.7160(14). 相似文献
16.
Chun GUO Xiao Dan LIU Zhen Gang XIE Chu Jun LI 《中国化学快报》2006,17(2):180-182
Ozagrel 1 is a 1-alkylimidazole derivative that acts as a selective inhibitor ofthromboxane A2 (TXA2) with an IC50 of 11mol/L. The beneficial effects of TXA2inhibition by ozagrel include improved motor coordination after experimental stroke, andantihypert… 相似文献
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A Convenient and Efficient Procedure for Oxime Ethers 总被引:1,自引:0,他引:1
Chun Bao LI* Yi CUI Wen Qin ZHANG Jian Lin LI Shuan Ming ZHANG Michael C. K. CHOI Albert S. C. CHAN Department of Chemistry Tianjin University Tianjin Open Laboratory of Chiraltechnology Department of Applied Biology and 《中国化学快报》2002,13(2)
In connection with our asymmetric reduction research, we are of interest to synthesize ketoxime ethers because they give good enantioselectivty in the reduction system of Lewis acid-NaBH4-Ligand1. In the literature the oxime ethers were made under anhydrous conditions using strong base such as NaH or sodium alkoxides to realize the substitution reaction between alkyl halide and oxime2. The reaction has also been performed under PTC conditions3. There were cases where the yields were low… 相似文献
19.
Synthesis of Cyclic Alkenylsiloxanes by Semihydrogenation: A Stereospecific Route to (Z)‐Alkenyl Polyenes 下载免费PDF全文
Bryony L. Elbert Diane S. W. Lim Haraldur G. Gudmundsson Jack A. O'Hanlon Dr. Edward A. Anderson 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(28):8594-8598
Cyclic alkenylsiloxanes were synthesized by semihydrogenation of alkynylsilanes—a reaction previously plagued by poor stereoselectivity. The silanes, which can be synthesized on multigram scale, undergo Hiyama–Denmark coupling to give (Z)‐alkenyl polyene motifs found in bioactive natural products. The ring size of the silane is crucial: five‐membered cyclic siloxanes also couple under fluoride‐free conditions, whilst their six‐membered homologues do not, enabling orthogonality within this structural motif. 相似文献
20.
Ping Yan BIE Cheng Lu ZHANG Xuan Jia PENG Xin Fu PAN* Department of Chemistry National Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 《中国化学快报》2002,13(9)
Celaphanol A was a diterpene isolated from the stems of Celastrus stephanotifolius1, which have been the subject of continued and growing interest, due to the range of biological activities shown by many members of this family2. Some have been used in traditional medicine3 or as a stimulant4 from ancient times. In order to further study the relationship between the structure and biological activity of the diterpene compound and as an extension of diterpenoid synthesis in our laboratory5, 6, … 相似文献