Studies on the Synthesis of Nargenicin A<sub>1</sub>: Highly Stereoselective Synthesis of the Complete Carbon Framework via the Transannular Diels−Alder Reaction of an 18-Membered Macrolide
作者:William R. Roush、Kazuo Koyama、Michael L. Curtin、Kevin J. Moriarty
DOI:10.1021/ja9607796
日期:1996.1.1
Yamaguchi macrolactonization of hydroxy acid 44 which is followed by the facile transannular Diels−Alder reaction of the 18-membered macrolide 22. This sequence provides tricycle 45 in 66% yield, along with a 14% yield of tricycle 46 which is epimeric at C(10). Macrolide 22 was obtained in 38% yield when the macrolactonization was performed at 80 °C. The transannular Diels−Alder reaction of 22 at 80