Molecules 2007, 12(11), 2507-2514; doi:10.3390/12112507
Article

Synthesis and Molecular Structure of Ethyl [N-tosyl-(R)-prolyloxy]-2(S)-[4-cyano-8,8-ethylenedioxy-5-oxo-5,6,7,8-tetrahydroindolizin-3-yl] Acetate, a Key Intermediate in the Total Synthesis of (20S)-Camptothecins

Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China
* Author to whom correspondence should be addressed.
Received: 24 May 2007; in revised form: 6 August 2007 / Accepted: 6 August 2007 / Published: 13 November 2007
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Abstract: The synthesis of optically active [N-tosyl-(R)-prolyloxy]-2(S)-[4-cyano-8,8-ethylenedioxy-5-oxo-5,6,7,8-tetrahydroindolizin-3-yl] acetate (4a), a key intermediate forthe total asymmetric synthesis of 20(S)-camptothecin anticancer drugs, is described. Itsstructure was characterized by 2D-NMR techniques and the absolute configuration wasfurther confirmed for the first time by X-ray crystal structure analysis.
Keywords: Ethyl [N-tosyl-(R)-prolyloxy]-2(S)-[4-cyano-8; 8-ethylenedioxy-5-oxo-5; 6; 7; 8-tetrahydroindolizin-3-yl] acetate; 2D-NMR techniques; X-ray crystal structure; configurational analysis.

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MDPI and ACS Style

Kuang, Y.-Y.; Chen, F.-E. Synthesis and Molecular Structure of Ethyl [N-tosyl-(R)-prolyloxy]-2(S)-[4-cyano-8,8-ethylenedioxy-5-oxo-5,6,7,8-tetrahydroindolizin-3-yl] Acetate, a Key Intermediate in the Total Synthesis of (20S)-Camptothecins. Molecules 2007, 12, 2507-2514.

AMA Style

Kuang Y-Y, Chen F-E. Synthesis and Molecular Structure of Ethyl [N-tosyl-(R)-prolyloxy]-2(S)-[4-cyano-8,8-ethylenedioxy-5-oxo-5,6,7,8-tetrahydroindolizin-3-yl] Acetate, a Key Intermediate in the Total Synthesis of (20S)-Camptothecins. Molecules. 2007; 12(11):2507-2514.

Chicago/Turabian Style

Kuang, Yun-Yan; Chen, Fen-Er. 2007. "Synthesis and Molecular Structure of Ethyl [N-tosyl-(R)-prolyloxy]-2(S)-[4-cyano-8,8-ethylenedioxy-5-oxo-5,6,7,8-tetrahydroindolizin-3-yl] Acetate, a Key Intermediate in the Total Synthesis of (20S)-Camptothecins." Molecules 12, no. 11: 2507-2514.

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