A new cytotoxic 2-（2-phenylethyl）chromone from Chinese eaglewood

A new compound 8-chloro-5,6,7-trihydroxy-2-（3-hydroxy-4-methoxyphenethyl）-5,6,7,8-tetralaydro-4H-chromen-4-one （1） was isolated from the Chinese eaglewood [Aquilaria sinensis （Lour.） Gilg]. Its structure was elucidated on the basis of spectral data. Compound I showed cytotoxicity against human gastric cancer cell line （SGC-7901） in vitro by MTT method with the IC50 value of 14.6 μg/mL.     

New 2-(2-phenylethyl)chromone derivatives from agarwood and their inhibitory effects on tumor cells

Abstract

Two new chromone derivatives, 7-hydroxy-2-[2-(3'-methoxy-4'-hydroxyphenyl)-ethyl]chromone (1), and 6,7-dimethoxy-2-[2-(3'-hydroxyphenyl)-ethyl]chromone (2) were isolated from the EtOH extract of agarwood of Aquilaria sinensis, together with eleven known analogues. Their structures were established by detailed HR-ESIMS, 1D and 2D NMR spectroscopic analysis, as well as comparison with the literature data. Selected the isolates (1, 2, 4–8, 10, 11) were tested for their antitumor activities against SMMC-7721, MGC-803 and OV-90 cell lines using the MTT method with cisplatin and paclitaxel as the positive control. All the tested compounds showed weak cytotoxic activities with IC₅₀ values ranged from 18.82 to 37.95 µg/ml.     

Facile Synthesis of 5-Hydroxy-2-（2-phenylethyl）chromone

5-Hydroxy-2-(2-phenylethyl)chromone(1) was synthesized from 2,6-dihydroxyacetophenone(7) obtained via four-steps resorcinol-reacting with phenylpropionic acid,the procedures involved are Baker-Venkataraman rearrangement and cyclization which are easy to conduct,the overall yield is 32%.     

Six new 2-(2-phenylethyl)chromones from Agarwood

Six new chromones, 6-methoxy-2-[2-(3-methoxy-4-hydroxyphenyl)ethyllchromone (2), 6,8-dihydroxy-2-(2-phenylethyl)chromone (3), 6-hydroxy-2-[2-(4-hydroxyphenyl)ethyl]chromone (4), 6-hydroxy-2-[2-(2-hydroxyphenyl)ethyl]chromone (5), 7-hydroxy-2-(2-phenylethyl)chromone (6), and 6-hydroxy-7-methoxy-2-(2-phenylethyl)chromone (7) were isolated from the ether extract of agarwood in addition to a known compound, 2-(2-phenylethyl)chromone or flidersiachromone (1). Their structures were determined by spectroscopic methods including UV, IR, and NMR spectral data and comparisons with the calculated values using the hydroxyl and methoxyl substituent increments of the chromone ring.     

Three 2-(2-phenylethyl) chromones and two terpenes from agarwood

A new Chromone, 7,8-dimethoxy-2-[2-(3'-acetoxyphenyl)ethyl]chromone (1) was isolated from an acetone extract of the Cambodian agarwood along with two known chromones, 6-methoxy-2-(2-phenylethyl)chromone (2) and 6,7-dimethoxy-2-(2-phenylethyl)chromone (3). In addition, an abietane ester (4) and the sesquiterpene dehydrofukinone (5) were isolated from the agarwood oil of the same origin. Structural elucidation of all isolated compounds was made based on IR, 1H and 13C NMR spectroscopic data.     

Five new benzophenone glycosides from the leaves of Aquilaria sinensis(Lour.) Gilg

Phytochemical investigation on the ethanol extract from the leaves of Aquitaria sinensis led to the isolation of five new benzophenone glycosides,aquilarinensides A-E(1-5).Their structures were elucidated by a combination of 1D and 2D NMR,HRMS,and chemical analysis.     

2,5-diphenyl-1,4-(trifluoromethylsulfonyl)piperazine from N-(2-bromo-2-phenylethyl)trifluoromethanesulfonamide

Russian Journal of Organic Chemistry -     

Synthesis of new 2-(alkenylsulfanyl)pyrimidine derivatives

Isothiuronium salts prepared by treatment of allyl bromide, 2,3- and 1,3-dichloropropenes, and 1,3-dichlorobut-2-ene with thiourea reacted with pentane-2,4-dione and 4,4,4-trifluoro-1-(thiophen-2-yl)-butane-1,3-dione to afford new pyrimidine derivatives, 2-(alkenylsulfanyl)-4,6-dimethyl- and 2-(alkenylsulfanyl)-4-(thiophen-2-yl)-6-(trifluoromethyl)pyrimidines.     

Hemisynthesis of new labdane derivatives from (-)-sclareol

A straightforward and very simple access to different analogues of (+)-subersic acid 7, the unnatural enantiomer (compounds 12) from naturally occurring (-)-sclareol 1 is described. We also report new conditions for the preparation of keto-intermediate 8 using maleic acid and describe hemiketal 11 as the new intermediate of degradative oxidation of 1.     

Synthesis of 1-(α-phenylethyl)azetidin-2-ones

Phase-transfer catalyzed cyclization of racemic and optically active N-substituted -aminoacids has given racemic and optically active 2-azetidinones, the spatial structures of which have been established by NMR spectroscopy. The original -aminoacids were obtained by adding -phenylethylamine to substituted acrylic acids.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1644–1647, December, 1984.     

Stereochemical analysis of N-cyclohexylidene-N-(1-phenylethyl)amine derivatives

The configurational properties of a series of cyclohexylidene imines are discussed on the basis of their 1H, 13C and 15N NMR spectral data.