Asymmetric total synthesis of (20S)-Camptothecin using a chiral auxiliary strategy
作者:Qian Liu、Minjie Liu、Guangxin Huang、Fen-er Chen
DOI:10.1016/j.tet.2019.03.028
日期:2019.5
An asymmetric eight-step total synthesis of (20S)-camptothecin, starting from the known compound tert-butyl (2-chloroquinolin-3-yl)methylcarbamate, is described. A Heck reaction followed by an intramolecular Michael addition to form the C-ring provides the first key step in this synthesis. The construction of the 20(S) chiral center relies on a chiral auxiliary-mediated Michael addition using (2R,
dihydropyridones or 2-pyridones have been prepared by nucleophilic addition of alpha-(methylsulfanyl)esterenolates to N-alkyl-2-fluoropyridinium salts, followed by acid hydrolysis or oxidation with concomitant hydrolysis, of the intermediate 2-fluoro-1,4-dihydropyridine adducts, respectively. Addition of the enolate derived from isopropyl alpha-(methylsulfanyl)butyrate to N-(quinolylmethyl)-2-fluoropyridinium
Novel syntheses of camptothecin alkaloids, part 2. concise synthesis of (S)-camptothecins
作者:Joseph M.D Fortunak、John Kitteringham、Antonietta R Mastrocola、Mark Mellinger、Nicolas J Sisti、Jeffery L Wood、Zhi-Ping Zhuang
DOI:10.1016/0040-4039(96)01205-1
日期:1996.8
convergent total synthesis of (S)-camptothecin alkaloids is described. The intramolecular [4+2] cycloaddition of an N-arylimidate with an alkyne is used to prepare the alkaloid ABC ring system.1 The chiral center is derived utilizing Seebach's chemistry2 for the diastereoselective Michael addition of a chiral dioxolanone enolate to a methylene malonate acceptor. The total synthesis of non-racemic topotecan
Synthetic Studies on the Azinothricin Family of Antibiotics. 4. Enantioselective Synthesis of the Northern Half of Antitumour Antibiotics A83586C and Citropeptin
作者:K Hale
DOI:10.1016/00404-0399(50)1381q-
日期:1995.9.18
Krohn, Karsten; Hamann, Ingo, Liebigs Annalen der Chemie, 1988, p. 949 - 954