Enantioselective total synthesis of (+)-isolaurepinnacin
作者:Daniel Berger、Larry E. Overman、Paul A. Renhowe
DOI:10.1021/ja00073a063
日期:1993.10
Total Synthesis of (+)-Isolaurepinnacin. Use of Acetal-Alkene Cyclizations To Prepare Highly Functionalized Seven-Membered Cyclic Ethers
作者:Daniel Berger、Larry E. Overman、Paul A. Renhowe
DOI:10.1021/ja964080b
日期:1997.3.1
The first synthesis of the title compound is described. The synthesis features an acetal-vinylsilane cyclization to stereoselectively form the cis-2,7-disubstituted oxepene ring and introduce Δ4 unsaturation. Starting with (2R,3S)-2,3-epoxypentan-1-ol (16), mixed acetal 10 is formed in five steps and 72% overall yield. Treatment of 10 with excess BCl3 in CH2Cl2 at −78 → 0 °C promotes cyclization to