A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by...A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by spectral evidences, especially by 2 D techniques.展开更多
The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 1...The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 15.549(4) ? b = 106.52(3), V = 1738.1(8) 3, Z = 4, Dc = 1.308 g/cm3, m = 0.086 mm-1 and F(000) = 720. The final R = 0.0331 and wR = 0.0850. The results show that the two phenyl rings of the anthrone fragment are not coplanar, but with a dihedral angle of 157.92. The middle ring of the anthrone moiety appears asymmetric boat conformation, while the 2,5-dimethoxyphenyl ring is restricted rotation. Therefore they exist in two optically active forms which are symmetrical glidingly.展开更多
Electrocarboxylation of anthrone in the presence of CO2 to anthrance-9-carboxylic acid directly was carried out. The electroreduction behavior of anthrone was examined by cyclic voltammetry in the absence and presence...Electrocarboxylation of anthrone in the presence of CO2 to anthrance-9-carboxylic acid directly was carried out. The electroreduction behavior of anthrone was examined by cyclic voltammetry in the absence and presence of CO2. Then the influences of the supporting electrolytes, temperature, electrode material and anthrone concentration on the carboxylation yield were investigated. Under the optimized conditions, anthrancene-9-carboxylic acid was obtained in a good yield(96.1%).展开更多
A highly enantioselective allylic substitution reaction of anthrones with aromatic or aliphatic allyl carbonates was realized by using iridium catalyst prepared from [Ir(COD)CI]2 and BHPphos. Substituted 10-allylant...A highly enantioselective allylic substitution reaction of anthrones with aromatic or aliphatic allyl carbonates was realized by using iridium catalyst prepared from [Ir(COD)CI]2 and BHPphos. Substituted 10-allylanthrones were obtained in excellent yields and with excellent enantioselectivity and regioselectivity (up to 98% yield, 99700 ee) under mild conditions.展开更多
文摘A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by spectral evidences, especially by 2 D techniques.
基金Project supported by the Zhejiang Natural Science Foundation (No. 200016)
文摘The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 15.549(4) ? b = 106.52(3), V = 1738.1(8) 3, Z = 4, Dc = 1.308 g/cm3, m = 0.086 mm-1 and F(000) = 720. The final R = 0.0331 and wR = 0.0850. The results show that the two phenyl rings of the anthrone fragment are not coplanar, but with a dihedral angle of 157.92. The middle ring of the anthrone moiety appears asymmetric boat conformation, while the 2,5-dimethoxyphenyl ring is restricted rotation. Therefore they exist in two optically active forms which are symmetrical glidingly.
基金Supported by the National Natural Science Foundation of China(No.20973065)the"Chen Guang"Project Supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation,China(No.10CG26)+1 种基金the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20100076120020)the Foundation of Outstanding Yong Talent in University of Anhui Province,China(No.2010SQRL042)
文摘Electrocarboxylation of anthrone in the presence of CO2 to anthrance-9-carboxylic acid directly was carried out. The electroreduction behavior of anthrone was examined by cyclic voltammetry in the absence and presence of CO2. Then the influences of the supporting electrolytes, temperature, electrode material and anthrone concentration on the carboxylation yield were investigated. Under the optimized conditions, anthrancene-9-carboxylic acid was obtained in a good yield(96.1%).
基金the National Basic Research Program of China (973 Program, No. 2015CB856600)National Natural Science Foundation of China (Nos.21572252, 21332009, 21421091) for generous financial support
文摘A highly enantioselective allylic substitution reaction of anthrones with aromatic or aliphatic allyl carbonates was realized by using iridium catalyst prepared from [Ir(COD)CI]2 and BHPphos. Substituted 10-allylanthrones were obtained in excellent yields and with excellent enantioselectivity and regioselectivity (up to 98% yield, 99700 ee) under mild conditions.