174092-79-6Relevant articles and documents
Studies toward practical synthesis of (20S)-camptothecin family through catalytic enantioselective cyanosilylation of ketones: Improved catalyst efficiency by ligand-tuning
Yabu, Kazuo,Masumoto, Shuji,Kanai, Motomu,Curran, Dennis P.,Shibasaki, Masakatsu
, p. 2923 - 2926 (2002)
Enantioselective catalyst efficiency for the synthesis of the camptothecin family was improved through ligand-tuning. Key intermediates of two convergent syntheses of camptothecin (Curran's intermediate and Corey's intermediate) were obtained in up to 10 g scale through the catalytic enantioselective cyanosilylation of ketones.
METHOD OF SYNTHESIZING CAMPTOTHECIN-RELATING COMPOUNDS
-
Page 34-35, (2010/02/05)
The present invention is to prepare efficiently 2'-amino-5'-hydroxypropiophenone corresponding to the AB-ring part of camptothecin (CPT) skeleton and a tricyclic ketone corresponding to the CDE-ring part in order to provide efficiently CPT by the total synthesis, which is a starting material for irinotecan hydrochloride and various kinds of camptothecin derivatives, and to provide stably CPT and its derivatives.
Catalytic enantioselective synthesis of (20s)-camptothecin intermediates using cyanosilylation of ketones promoted by D-glucose-derived lanthanide catalyst
Yabu, Kazuo,Masumoto, Shuji,Kanai, Motomu,Du, Wu,Curran, Dennis P.,Shibasaki, Masakatsu
, p. 369 - 385 (2007/10/03)
An efficient catalytic enantioselective synthetic route was developed for Curran's versatile camptothecin intermediate (5). The key step is the catalytic enantioselective cyanosilylation of ketone (7) using a chiral samarium (Sm) complex. The target ketone cyanohydrin (6) was obtained with 90% ee using 2 mol % of the catalyst. A gadolinium (Gd) complex derived from the same chiral ligand could also be used as an enantioselective catalyst to synthesize Corey's intermediate (11).
A general synthetic approach to the (20s)-camptothecin family of antitumor agents by a regiocontrolled cascade radical cyclization of aryl isonitriles
Josien, Hubert,Ko, Sung-Bo,Bom, David,Curran, Dennis P.
, p. 67 - 83 (2007/10/03)
A general and efficient synthesis of (20S)-camptothecin (1a) is reported. A key common intermediate containing the pyridone and lactone (DE) rings of camptothecin and most derivatives was constructed from 2-trimethylsilyl-6-methoxypyridine by a series of metalation reactions and a Heck cyclization to provide an achiral bicyclic enol ether. Sharpless asymmetric dihydroxylation followed by lactol oxidation and iododesilylation produced the key intermediate in 94% enantiomeric excess. Alkylation with prop-argyl bromide and a cascade radical reaction with phenyl isonitrile then produced 1a. About 20 other penta-and hexacyclic analogues of camptothecin with differing single or multiple substituents at C7, C9, C10, C11, and/or C12 were made by changing the propargylating agent and the isonitrile. Included among these are several drug candidates and the approved drugs topotecan and irinotecan. The synthesis of the prodrug irinotecan is a direct one that does not pass through the active metabolite. The use of ortho-trimethylsilyl-substituted isonitriles allows the regioselective synthesis of camptothecin analogues in cases where isomeric mixtures are formed from the parent isonitriles. The synthesis of the derivatives relies on the broad scope and functional group tolerance of the key cascade radical reaction.
Kaskaden-Radikalreaktionen von Isocyaniden: eine zweite Generation der Synthese von (20S)-Camtothecin, Topotecan, Irinotecan und G1-147211C
Curran, Dennis P.,Ko, Sung-Bo,Josien, Hubert
, p. 2948 - 2950 (2007/10/03)
Keywords: Camptothecin; Isocyanide; Kaskadenreaktionen; Radikale
