30062-37-4Relevant articles and documents
Combined directed ortho metalation/cross-coupling strategies: Synthesis of the tetracyclic A/B/C/D ring core of the antitumor agent camptothecin
Nguyen, Tam,Wicki, Markus A.,Snieckus, Victor
, p. 7816 - 7821 (2004)
A convergent synthesis of the A/B/C/D ring fragment 5 of camptothecin using a combination of directed ortho metalation and Negishi cross-coupling is described. The key features of the synthetic sequence are an anionic ortho-Fries rearrangement (10 → 12), a Negishi cross-coupling (7 → 6), and a terminal modified von Braun reaction (16 → 5) that leads to tetracyclic derivative 5 in 7 steps and 11% overall yield.
A synthetic camptothecin compound in 5-6 method of and ring structure (by machine translation)
-
, (2016/10/20)
The present invention discloses a synthetic camptothecin compound in the 5 [...] 6 method of and ring structure, the method is that the conjugated structure of formula II occurs in the solvent alkene alkyne ester series cyclization reaction in the molecule, thus the system results in the type shown in I of the 5 [...] 6 and ring structure, the specific equation is: In the formula: R 1 and R 2 are respectively and independently selected from hydrogen, alkyl, cycloalkyl, aryl or heterocyclic group; or, R 1 and R 2 together form a saturated or unsaturated carbocyclic or heterocyclic; R 3 and R 4 are respectively and independently selected from hydrogen, alkyl, cycloalkyl, aryl or heterocyclic group; or, R 3 and R 4 together form a saturated or unsaturated carbocyclic or heterocyclic rings; selected from R C 1-C 4 alkyl; P is amino protecting group. The stated method of this invention has the advantages of simple operation, safety and environmental protection, low production cost, high yield, is suitable for large-scale production, and the like, to promote such compounds in the medical field with the extensive application of an important value. (by machine translation)
Traceless solid-phase synthesis of mappicine ketone library via multiple chemoselective palladium-catalyzed reactions on benzenesulfonate linker
Tsukamoto, Hirokazu,Suzuki, Risako,Kondo, Yoshinori
body text, p. 2005 - 2010 (2009/04/10)
We report here a solid-phase synthesis of a library of mappicine ketone, a leading antiviral compound with activity against herpes viruses and human cytomegalovirus. The synthesis is based on multiple chemoselective palladium-catalyzed reactions involving