CN
Search Within
216607
应用筛选条件
关键词:'216607'
显示 1-30 共 35 条结果 关于 "216607" 范围 论文
Kevin M McQuaid et al.
Journal of the American Chemical Society, 131(2), 402-403 (2008-12-23)
C-H bond functionalization enables strategically new approaches to the synthesis of complex organic molecules including biologically active compounds, research probes and functional organic materials. To address the shortcomings of transition metal catalyzed processes, we have developed a new approach to
U C Reddy et al.
The Journal of organic chemistry, 74(6), 2605-2608 (2009-02-17)
A diastereoselective one-pot, three-component Prins-Friedel-Crafts reaction was developed for the synthesis of 4-aryltetrahydropyran derivatives from the reaction of carbonyl compounds with homoallylic alcohol in the presence of arene promoted by boron trifluoride etherate.
Hui Xu et al.
Bioorganic & medicinal chemistry letters, 21(13), 4008-4012 (2011-06-03)
Twenty-one 4α-acyloxy-2-chloropodophyllotoxin derivatives (5a-u), whose C-4 spatial configuration was mainly stereocontrolled by the configuration of C-2 chlorine atom, were unexpectedly prepared by the reaction of 2-chloropodophyllotoxin with carboxylic acids in the presence of BF(3)·Et(2)O. Compared with ordinary esterifications of carboxylic
Tetrahedron, 50, 12395-12395 (1994)
Meng-Yang Chang et al.
Organic letters, 12(6), 1176-1179 (2010-03-03)
An easy and straightforward synthesis of 6,10b-diarylhexahydrobenzo[f]isoquinoline by the repeated treatment of boron trifluoride etherate (BF(3) x OEt(2)) is reported. The overall transformation from 4-arylpiperidin-3-one to benzo[f]isoquinoline proceeds via ring contraction, chain elongation, and intramolecular electrophilic cyclization in moderate yields.
T Saitoh et al.
Chemical & pharmaceutical bulletin, 49(8), 979-984 (2001-08-23)
A synthesis of 6,7-dimethoxy-3-phenyl-1,2,3,4-tetrahydroisoquinoline (14a) and 7,8-dimethoxy-2-phenyl-1,2,4,5-tetrahydro-3H-3-benzazepine (14b) was achieved via the cyclization of N-(3,4-dimethoxyphenyl)methyl-1-phenyl-2-(phenylsulfinyl)ethylformamide (6a) and N-2-(3,4-dimethoxyphenyl)ethyl-1-phenyl-2-(phenylsulfinyl)-ethylformamide (6b) using the Pummerer reaction as a key step, respectively. The Pummerer reaction of 6a,b under usual conditions using trifluoroacetic anhydride yielded
Krzysztof Babiuch et al.
Biomacromolecules, 16(7), 1948-1957 (2015-06-10)
Inspired by upregulated levels of fucosylated proteins on the surfaces of multiple types of cancer cells, micelles carrying β-l-fucose and β-d-glucose were prepared. A range of block copolymers were synthesized by reacting a mixture of 2-azidoethyl β-l-fucopyranoside (FucEtN3) and 2-azideoethyl
M S F Lie Ken Jie et al.
Chemistry and physics of lipids, 125(2), 93-101 (2003-09-23)
Methyl santalbate (methyl trans-11-octadecen-9-ynoate) from Sandal wood seed oil, Santalbum alum) was epoxidized to methyl trans-11,12-epoxy-octadec-9-ynoate (1). Treatment of compound 1 with tetrabutylammonium dihydrogentrifluoride, and boron trifluoride etherate gave the corresponding anti- (2a) (57%) and syn- (2b) (35%) fluorohydrin derivatives
George R Pettit et al.
Journal of natural products, 74(9), 1922-1930 (2011-09-09)
The synthesis of bis-steroidal pyrazines derived from 3-oxo-11,21-dihydroxypregna-4,17(20)-diene (4) and glycosylation of a D-ring side chain with α-L-rhamnose have been summarized. Rearrangement of steroidal pyrazine 10 to 14 was found to occur with boron triflouride etherate. Glycosylation of pyrazine 10
The Journal of Organic Chemistry, 54, 4982-4982 (1989)
Xiang-Bao Meng et al.
Carbohydrate research, 342(9), 1169-1174 (2007-04-05)
3,4,6-Tri-O-acetyl-D-galactal, 3,4,6-tri-O-acetyl-D-glucal and 3,6,2',3',4'6'-hexa-O-acetyl-D-lactal were reacted with N-hydroxymethylphthalimide and boron trifluoride etherate to produce the corresponding phthalimidomethyl unsaturated glycosides via Ferrier rearrangement. When the galactal derivative was used, a non-Ferrier rearrangement product was also isolated as a minor product under
Deepak Sail et al.
Carbohydrate research, 357, 47-52 (2012-06-29)
D-Glucose, lactose, maltose, and melibiose were benzoylated with Bz(2)O-Et(3)N reagent to give fully benzoylated β products. Under the same conditions, D-mannose produced a mixture where the β-benzoate predominated. Treatment of the foregoing compounds with EtSH at slightly elevated temperature (50-60°C)
The Journal of Organic Chemistry, 54, 4739-4739 (1989)
(1-Alkynyl)dicarbonylcyclopentadienyliron complexes as electron-rich alkynes in organic synthesis: BF3-mediated [2+2] cycloaddition/ring-opening providing (2-alkenyl-1-imino)iron complexes.
Ryotaro Nakaya et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 17(31), 8559-8561 (2011-06-23)
Brajendra K Sharma et al.
Journal of agricultural and food chemistry, 56(9), 3049-3056 (2008-04-11)
Vegetable oils are promising candidates as substitutes for petroleum base oils in lubricant applications, such as total loss lubrication, military applications, and outdoor activities. Although vegetable oils have some advantages, they also have poor oxidation and low temperature stability. One
Myriam Roussel et al.
Carbohydrate research, 338(4), 375-378 (2003-02-01)
The BF3-promoted glycosylation of D-mannofuranurono-6,3-lactone with dodecanol or methanol afforded n-alkyl beta-D-mannofuranosidurono-6,3-lactone. Reduction of n-dodecyl beta-D-mannofuranosidurono-6,3-lactone with sodium borohydride yielded the corresponding alkyl beta-D-mannofuranoside.
Bjart Frode Lutnaes et al.
Journal of the American Chemical Society, 126(29), 8981-8990 (2004-07-22)
A series of charge-delocalized carotenoid mono- and dications have been prepared by treatment of selected carotenoids with Brønsted and Lewis acids. The detailed structures of the carbocations were established by NMR studies in the temperature range from -10 to -20
Masanobu Yamamoto et al.
ChemSusChem, 13(17), 4400-4408 (2020-07-22)
Increases in coniferaldehyde content, a minor lignin residue, significantly improves the sustainable use of plant biomass for feed, pulping, and biorefinery without affecting plant growth and yields. Herein, different analytical methods are compared and validated to distinguish coniferaldehyde from other
Wen Jen Lin et al.
Carbohydrate polymers, 120, 7-14 (2015-02-11)
The aim of this study was to develop hepatocyte-targeting non-viral polymeric nono-carriers for gene delivery. Chitosan was selected as the main polymer. An asialoglycoprotein receptor recognized sugar, galactose, was introduced. The methoxy poly(ethylene glycol) (mPEG) or short chain poly(ethylene glycol)
Omar Viñas-Bravo et al.
Steroids, 77(1-2), 59-66 (2011-11-09)
We report a facile protocol to obtain 22-substituted furostans and pseudosapogenins in high yields from (25R)- and (25S)-sapogenins. This method involves the treatment of the sapogenin with acetic-trifluoroacetic mixed anhydride and BF(3)·OEt(2) at room temperature, followed by the addition of
Hatim Filali et al.
Carbohydrate research, 345(17), 2421-2426 (2010-10-22)
The aldol reaction between cis-3-((tert-butyldiphenylsilyloxy)methyl)oxirane-2-carbaldehyde and ethyl-2-(trimethylsilyloxy)-2-propenoate promoted by boron trifluoride diethyl etherate was reinvestigated. By varying the work-up conditions, a new 2-deoxy-2-fluoro heptulosonic ester analogue was synthesized. Derivatizations and detailed NMR analysis allowed the complete characterization of this fluoro
Christopher A DeRosa et al.
ACS applied materials & interfaces, 7(42), 23633-23643 (2015-10-20)
The dual-emissive properties of solid-state difluoroboron β-diketonate-poly(lactic acid) (BF2bdkPLA) materials have been utilized for biological oxygen sensing. In this work, BF2dbm(X)PLA materials were synthesized, where X = H, F, Cl, Br, and I. The effects of changing the halide substituent
Barry M Trost et al.
The Journal of organic chemistry, 72(24), 9372-9375 (2007-10-30)
A convenient access to substituted allyl enol carbonates was established through the reaction of ketone enolates with the complex of allyl 1H-imidazole-1-carboxylates and boron trifluoride etherate.
Peiming Chen et al.
Journal of controlled release : official journal of the Controlled Release Society, 194, 341-349 (2014-09-16)
Macrophages are involved in a number of diseases, such as HIV infection/AIDS, tuberculosis, tumor development and atherosclerosis. Macrophages possess several cell surface receptors (e.g., the mannose receptor, MR) that may serve as drug delivery cellular portals for nanocarriers (NCs). In
Chao-Yue Chen et al.
Yao xue xue bao = Acta pharmaceutica Sinica, 46(1), 64-69 (2011-04-06)
It was found that psoralen derivative could perform a Friedel-Crafts acylation smoothly with acetic anhydride to give 5'-acetylpsoralen in a 73% yield. In the presence of boron trifluoride etherate, 5'-acetylpsoralen reacted with both aromatic amines and aliphatic amine smoothly to
Francesca Salis et al.
Small (Weinheim an der Bergstrasse, Germany), 14(20), e1703810-e1703810 (2018-04-18)
Fluorescence immunoassays are popular for achieving high sensitivity, but they display limitations in biological samples due to strong absorption of light, background fluorescence from matrix components, or light scattering by the biomacromolecules. A powerful strategy to overcome these problems is
Pipas Saha et al.
Organic & biomolecular chemistry, 9(12), 4626-4634 (2011-04-23)
An efficient methodology for the synthesis of oxabicyclo[3.3.1]nonenes and substituted tetrahydropyrans has been developed in moderate yields from the reaction of geraniol with aldehydes and epoxides promoted by boron trifluoride etherate.
Na Kong et al.
Carbohydrate research, 405, 33-38 (2015-03-10)
Carbohydrate-functionalized single-walled carbon nanotubes (SWNTs) were synthesized using microwave-assisted reaction of perfluorophenyl azide with the nanotubes. The results showed that microwave radiation provides a rapid and effective means to covalently attach carbohydrates to SWNTs, producing carbohydrate-SWNT conjugates for biorecognition. The
Karen M Ruíz-Pérez et al.
Steroids, 77(7), 819-828 (2012-03-28)
Treatment of steroid sapogenins with benzaldehyde and BF(3)·Et(2)O cleanly produces E-23(23')-benzylidenspirostanes in good yields in a reaction pathway which consists on an aldol reaction followed by a dehydration step. The obtained E-23(23')-benzylidenspirostanes can be easily converted to dinorcholanic lactones by
Devendra J Vyas et al.
The Journal of organic chemistry, 75(19), 6720-6723 (2010-09-10)
The BF(3)·OEt(2)-mediated allylation of isatin with an α-chiral allylic stannane is diastereo- and enantioselective. Conversely, allylation of any substituted isatin employing the identical protocol is not diastereoselective at all and only enantioselective for the major diastereomer having syn relative configuration.
1/2