A new guaiane-type sesquiterpenoid from Croton yunnanensis / 中国中药杂志

Five sesquiterpenoids were isolated from 90% ethanol extract of Croton yunnanensis by silica gel,Sephadex LH-20 column chromatography,as well as prep-HPLC methods. Based on MS,1 D and 2 D NMR spectral analyses,the structures of the five compounds were identified as 11-methoxyl alismol(1),6β,7β-epoxy-4α-hydroxyguaian-10-ene(orientalol C,2),multisalactone D(3),arvestonol(4),and 4,5-dihydroblumenol A(5). Compound 1 was a new guaiane-type sesquiterpenoid. Compounds 2-4 were isolated from the Croton genus for the first time,and compound 5 was obtained from this plant for the first time.

Chemical constituents from Perovskia atriplicifolia / 中国中药杂志

An investigation on the chemical constituents of the 90% EtOH extract of Perovskia atriplicifolia led to the isolation of fifteen compounds from the EtOAc fraction. Based on the detailed spectral analysis (MS, 1D and 2D NMR), as well as comparison with the literatures, the structures of compounds 1-15 were determined as cirsimaritin (1), salvigenin (2), syringaldehyde (3), vinyl caffeate (4), 2α, 3α-dihydroxyolean-12-en-28-oicacid (5), 2α, 3α-dihydroxyurs-12-en-28-oicacid (6), niga-ichigoside F1 (2α, 3β, 19α, 23- tetrahydroxyurs - 12-en-28-oicacid- O-β-D- glucopyranoside, 7), sericoside (8), 4-epi-niga-ichigoside F1 (2α, 3β, 19α, 24-tetrahydroxyurs-12-en-28-oicacid O-β-D-glucopyranoside, 9), 2α, 3β, 24-trihydroxyolean-12-en-28-oicacid O-β-D-glucopyranosyl-(1 --> 2) - β-D-glucopyranoside (10), pruvuloside A (11), asteryunnanoside A [2α, 3β, 23-trihydroxyolean-12-en-28-oicacid O-β-D-glucopyranosyl-(1 --> 2)-β- D- glucopyranoside,12], rosmarinic acid methyl ester (13), β-sitosterol (14), and daucosterol (15), respectively. Compounds 1-13 were isolated from the Perovskia genus for the first time. All the compounds were obtained from P. atriplicifolia for the first time.

Studies on chemical constituentsfrom leaves of Acer truncatum / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents from the leaves of Acer truncatum.</p><p><b>METHOD</b>Various chromatographic techniques were used to isolate and purify the constituents. The structures of these compounds were elucidated on the basis of spectral analysis.</p><p><b>RESULT</b>Seven compounds were isolated and identified as p-sitosterol (1), beta-amyrin (2), beta-amyrin acetate (3), 3, 5-dihydroxy-4-methoxybenzoic acid (4), astragalin (5), quercetin-3-O-beta-D-galactoside (6), and quercetin-3-O-alpha-L-rhamnoside (7).</p><p><b>CONCLUSION</b>All of compounds were isolated from this plant for the first time.</p>

Studies on chemical constituents of Cynanchum forrestii / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents of Cynanchum forrestii.</p><p><b>METHOD</b>Chromatographic techniques were applied to isolated chemical constituents. The structures were identified on the basis of physico-chemical constants and spectroscopic data.</p><p><b>RESULT</b>Eight compounds were isolated from the 95% ethanol extract of the roots of C. forrestii and elucidated as ( + ) -5'-methoxyisolariciresinol 3a-O-beta-D-glucopyranoside (1), hexahydroxycholest-7-en-6-one (2), tylophorinidine (3), sucrose (4), palmitic acid (5), beta-sitosterol (6), daucosterol (7), nonanedioic acid (8).</p><p><b>CONCLUSION</b>Compounds 1-3 from this genus, and compounds 4-8 from the plant were obtained for the first time.</p>

Studies on chemical constituents from roots of Craibiodendron henryi / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents from the roots of Craibiodendron henryi.</p><p><b>METHOD</b>Various chromatographic techniques were used to isolate and purify the constituents. The structures were elucidated by chemical evidence and spectral methods.</p><p><b>RESULT</b>Twelve compounds were isolated from the ethyl acetate soluble fraction of the 95% ethanolic extract and their struc- tures were elucidated as quercetin (1), quercetin-3-O-rhamnicoside (2), quercetin-3-O-arabinofuranoside (3), (-)-epicatechin (4), proanthocyanidin A-2 (5), procyanidin B-2 (6), (-)-isolariciresinol-2a-O-beta-D-xylopyranoside (7), lyoniside (8), sitoster-yl-3beta-glucoside-6'-O-palmitate (9), beta-sitosterol (10), daucosterol (11) and octacosanoic acid (12).</p><p><b>CONCLUSION</b>Compounds 1-12 were isolated from this plant for the first time.</p>