Synthesis of indolizinoquinolinones through three- and four-component domino Knoevenagel / hetero-Diels–Alder reactions: novel access to (+)-camptothecin
作者:Lutz F. Tietze、Matthias Bischoff、Taukeer A. Khan、Deshan Liu
DOI:10.1007/s10593-017-2070-4
日期:2017.4
The fused heterocyclic indolizinoquinolinone system is a key structural feature of several highly bioactive alkaloids, including camptothecin. Camptothecin has been efficiently obtained by a three- or four-component domino Knoevenagel / hetero-Diels–Alder reaction of aldehyde, Meldrum's acid, and enol ether in the presence or absence of alcohol, followed by reductive cleavage of the amine protecting
Formal total synthesis of camptothecin via ring-closing metathesis strategy
作者:Subhash P. Chavan、K. Pasupathy、M.S. Venkatraman、Ramesh R. Kale
DOI:10.1016/j.tetlet.2004.07.101
日期:2004.9
A formaltotalsynthesis of camptothecin 1 is presented. The key steps include construction of the D-ring of camptothecin featuring an efficient ring-closing metathesis (RCM) reaction and the subsequent Michael addition of nitropropane across the double bond of the dihydropyridone 3.