Citation: Rui Yun GUO, Jun Biao CHANG, Rong Feng CHEN, Jing Xi XIE, Da Yu YAN. The Synthesis of α-DDB, β-DDB and Theoretical Study with AM1[J]. Chinese Chemical Letters, ;2001, 12(6): 491-494. shu

The Synthesis of α-DDB, β-DDB and Theoretical Study with AM1

1.
Henan Institute of Chemistry, Zhengzhou 450002;
2.
Institute of Meteria Medica, Chinese Academy of Medical Science, Beijing 100050;
3.
The Graduate School of University of Science and Technology of China, Beijing 100039

Received Date: 10 July 2000

Fund Project: The authors are grateful to the Henan Outstanding Younth and Natural Science Foundation of China for financial support and professor Ming DAI (Henan Institute of Chemistry Henan Academy of Science) for supplying the data △H_f of CuBr₂

The present paper reports the synthesis of two analogs of Schzandrin C α-DDB, β-DDB with the gallic acid as the starting material. The key step is the synthesis of monomer of β-DDB and α-DDB for coupling. α-DDB, β-DDB have different yields in Ullmann coupling reaction under the same condition. The yield of α-DDB is little lower than that of β-DDB. The AM1 calculation demonstrates that ΔH of the Ullmann coupling reaction of α-DDB and β-DDB are different. The former is -175.76966KJ/mol and the later is -203.21246KJ/mol. This is in agreement with the fact that β-DDB has higher yield than α-DDB.
- Analogs of Schzandrin C,
- biphenyl,
- dimenthoxy dicarboxylate biphenyl,
- AM1 calculation
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