Practical formal total synthesis of (rac)- and (S)-camptothecin
作者:René Peters、Martin Althaus、Anne-Laure Nagy
DOI:10.1039/b514147h
日期:——
A practical, efficient and scalable formaltotalsynthesis of (rac)- and (S)-camptothecin is described, which proceeds via the known DE ring building blocks 19 and (S)-19, respectively. The racemic synthesis starts from diethyl oxalate and uses straightforward carbonyl chemistry in order to generate the pyridone ring system. 19 was formed in 8.4% overall yield over 9 linear steps avoiding any chromatographic