Iodocyclization and Prins-Type Macrocyclization: An Efficient Formal Synthesis of Leucascandrolide A
作者:J. S. Yadav、Manas R. Pattanayak、Pragna P. Das、Debendra K. Mohapatra
DOI:10.1021/ol200223q
日期:2011.4.1
The formal total synthesis of leucascandrolide A has been achieved in 20 steps from a known epoxide with an overall yield of 11.5% following a recently developed strategy for the construction of trans-2,6-disubstituted-3,4-dihydropyrans and a Lewis acid catalyzed intramolecular Prins-cyclization of an aldehydic homoallylic alcohol to generate the tetrahydropyran ring with three stereogenic centers
按照最近开发的构造反式-2,6-二取代-3,4-二氢吡喃和路易斯酸的策略,从已知的环氧化物以20个步骤完成了芥子酸内酯A的正式全合成,总收率为11.5%。催化醛内均丙醇的分子内Prins环化反应,生成带有三个立体异构中心和大环的四氢吡喃环。