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Chemistry of Taxoid Sinenxan A: (Ⅰ) Epimerization of the 14β-hydroxyl Group

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chinese Chemical Letters 1997年第4期8卷 277-280页

作者： Guang Yan HUANG Ji Yu GUO Xiao Tian liANG(institute of materia medica, chinese Academy of medical Sciences &Peking Union medical College, Beijing 100050) institute of materia Medico Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100050 China

Compound 2 with 14β-hydroxyl group was successfully converted into its epimerized α-counterpart via oxidation - *** elimination product (6) was auto-oxidized to epoxide 8,even in the solid state

关键词： Cl Epimerization of the 14 hydroxyl Group Chemistry of Taxoid Sinenxan A

Studies on the Synthesis of Villosol

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chinese Chemical Letters 1997年第1期8卷 27-30页

作者： Ping XIE Shu Feng CREN Xiao Tian liANG(institute of materia medica, chinese Academy of medical Sciencesand Peking Union medical College, Beijing 100050) BEIJING UNION MED COLL CHINESE ACAD MED SCIINST MAT MEDBEIJING 100050PEOPLES R CHINA

The stereocontrolled synthesis of 2, the structure proposed for villosol, was described. The synthetic work has shown that the proposed structure was incorrect.

关键词： HNMR cm IR MHz Studies on the Synthesis of Villosol CDC KBr

Total Synthesis of (±)Chrysotricine

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chinese Chemical Letters 1998年第4期9卷 357-360页

作者： Guang Xing WANG Shu Feng CHEN Xiao Tian liANG(institute of materia medica, chinese Academy of medical Sciences & Peking Union medical College, Beijing 100050) institute of materia medica Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100050 China

(±)Chrysotricine 1 was synthesized by a facile route. The key steps in the synthesis were aldol condensation of dilithium salt of harman 4 with 6 -methyl-5-hepten-2-one 5 and cyclization of compound 6 using MCPBA. Th... 详细信息

关键词： (±)chrysotricine aldol condensation dilithium salt of harman

Chemical Studies on Decahydroacenaphthylene Compounds-Studies on the Synthesis of Hainanolide-Construction of Tricyclic Intermediate

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chinese Chemical Letters 1998年第3期9卷 261-262页

作者： Zheng Qi YANG Shi Zhi CHEN liang HUANG (institute of materia medica, chinese Academy of medical Science,Peking Union medical College, Beding 100050) chinese Acad Med Sci Inst Mat Med Peking Union Med Coll Beijing 100050 Peoples R China

The tricyclic compound is constructed via intramolecular Diels-Alder reaction. It might serve as the important intermediate for the total synthesis of hainanolide. The isolation and structures of three by-products wer... 详细信息

关键词： decahydroacenaphthylene intramolecular Diels-Alder reaction

SYNTHESIS OF DIISOFERUliC ACID

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chinese Chemical Letters 1994年第6期5卷 493-496页

作者： Chun Bo AI and lian Niang li (institute of materia medica, chinese Academy of medical Sciences,Peking Union medical College. 1 Xian Nong Tan Street, Beijing 100050)

Diisoferulic acid 3a which has the same configuration as salvianolic acid E was synthesized using isovanillinas stuning material. Its Z isomer 3b was obtained during hadrolysis in a basic solution.

关键词： SYNTHESIS OF DIISOFERUliC ACID

Synthesis of β-(2,3-dihydroxy-benzoyl)butyric acid

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chinese Journal of Chemistry 1987年第3期5卷 257-260页

作者： WANG De-Xin liAMG Xiao-Tian*, institute of materia medica, chinese Academy of medical Sciences, Beijing institute of materia medica Chinese Academy of Medical Sciences Beijing

β-(2,3-Dihydroxybenzoyl)butyric acid (1), a new natural product, has been synthesizedfrom o-vahillin via a seven-step process with an overall yield of 21.3 %. The key reaction step in-volved in this synthesis was the... 详细信息

关键词： Synthesis of dihydroxy-benzoyl)butyric acid

The Ephemeral 10β-OH Trifluoromethanesulfonates of 7-Epi Paclitaxel Analogs─A New Example for Anchimeric Assistance

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chinese Chemical Letters 1998年第1期9卷 29-33页

作者： Wei Shuo FANG Qi Cheng FANG and Xiao Tian liANG (institute of materia medica, chinese Academy of medical Sciences & Peking Union medical College, Beijing 100050 ) chinese Acad Med Sci Inst Mat Med Beijing 100050 Peoples R China Peking Union Med Coll Beijing 100050 Peoples R China

Two rearranged products, dienone 4 and 10-oxo product 5 were obtained upon attempted 10β-OSO2SO2CF3 formation from 3. The formation of compound 5 can be explained by anchimeric assistance of 7α-OH. Reduction of 4 ... 详细信息

关键词： rearrange anchimeric assistance neighboring group participation

Study on Unexpected Cycloaddition Reactions of Imines with THF

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chinese Chemical Letters 2000年第6期11卷 475-478页

作者： Jun ZHAO Ping XIE Shu Feng CHEN Xiao Tian liANG (institute of materia medica ,chinese Academy of medical Sciences ＆ Peking Union medical College， Beijing 100050) chinese Acad Med Sci Inst Mat Med Beijing 100050 Peoples R China Peking Union Med Coll Beijing 100050 Peoples R China

An unexpected tricyclic compound 2,3,3a,4,5,9b-hexahydrophenylfuro[3.2-c] quinoline 4 and its aromatized product 6 were obtained when the cycloaddtion of imine 1 and substituted norbornene 2 was carried out in THF with a catalytic amount of boron trifluoride. The structures of the products were determined by spectral data and the mechanism of reaction was substantiated by the imitation reaction.

关键词： imine THF cycloaddition reaction

Three New Compounds from Forsythia Suspensa (Thunb.) Vahl

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chinese Chemical Letters 1998年第1期9卷 51-55页

作者： Dong Sheng MING De Quan YU Shi Shan YU (institute of materia medica, chinese Academy of medical Sciences and Peking Union medical College, Beijing 100050) chinese Acad Med Sci Inst Mat Med Beijing 100050 Peoples R China Peking Union Med Coll Beijing 100050 Peoples R China

Three new compounds, suspenolic acid (1), forsythenside A (2), and forsythenside B (3) have been isolated from the fruits of Forsythia suspensa. Their structures were elucidated by spectral methods including IR, H-1- ... 详细信息

关键词： Forsythia Suspensa(Thunb.) Vahl suspenolic acid forsythenside