Asymmetric α-Hydroxylation of a Lactone with Vinylogous Pyridone by Using a Guanidine-Urea Bifunctional Organocatalyst: Catalytic Enantioselective Synthesis of a Key Intermediate for (20S)-Camptothecin Analogues

Systematic Review of topotecan (Hycamtin) in relapsed small cell lung cancer

(2016) Rob Riemsma et al.   BMC CANCER

Highly facile approach to the formal total synthesis of camptothecin

(2013) Changqing Wei et al.   TETRAHEDRON LETTERS

Practical Synthesis of (20S)-10-(3-Aminopropyloxy)-7-ethylcamptothecin, a Water-Soluble Analogue of Camptothecin

(2012) Tatsuya Watanabe et al.   Chemistry-An Asian Journal

Asymmetric Direct α-Hydroxylation of β-Oxo Esters Catalyzed by Chiral Quaternary Ammonium Salts Derived from Cinchona Alkaloids

(2012) Hongjie Yao et al.   JOURNAL OF ORGANIC CHEMISTRY

Linking Conformational Flexibility and Kinetics: Catalytic 1,4-Type Friedel-Crafts Reactions of Phenols Utilizing 1,3-Diamine-Tethered Guanidine/Bisthiourea Organocatalysts

(2011) Yoshihiro Sohtome et al.   Chemistry-An Asian Journal

Total Synthesis of Camptothecin and SN-38

(2011) Shanbao Yu et al.   JOURNAL OF ORGANIC CHEMISTRY

Solvent-Dependent Enantiodivergent Mannich-Type Reaction: Utilizing a Conformationally Flexible Guanidine/Bisthiourea Organocatalyst

(2010) Yoshihiro Sohtome et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Entropy-Controlled Catalytic Asymmetric 1,4-Type Friedel-Crafts Reaction of Phenols Using Conformationally Flexible Guanidine/Bisthiourea Organocatalyst

(2010) Yoshihiro Sohtome et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Asymmetric Direct α-Hydroxylation of β-Oxo Esters by Phase-Transfer Catalysis Using Chiral Quaternary Ammonium Salts

(2010) Mingming Lian et al.   EUROPEAN JOURNAL OF ORGANIC CHEMISTRY

Formal synthesis of (±)-camptothecin via tricyclic lactone as key synthon

(2010) Subhash P. Chavan et al.   TETRAHEDRON LETTERS

Enantioselective Aza-Henry Reaction with Acyclic Guanidine-Thiourea Bifunctional Organocatalyst

(2009) Keisuke Takada et al.   ADVANCED SYNTHESIS & CATALYSIS

Synthetic Studies on Camptothecins. Part 1

(2008) Li-Peng Zhang et al.   HELVETICA CHIMICA ACTA

Expeditious Total Syntheses of Camptothecin and 10-Hydroxycamptothecin

(2008) Guan-Sai Liu et al.   ORGANIC LETTERS