Synthesis of the C3–C7 fragment of tylonolide by the γ-hydroxybutenolide approach
作者:William H. Miles、Cassidy M. Madison、Michael L. Mastria、Pui-In Tang
DOI:10.1016/j.tetlet.2016.07.060
日期:2016.8
The seven-step synthesis of the C3–C7 fragment from 3-furanmethanol is described. The key step is an asymmetric aldol reaction of a γ-hydroxybutenolide with the titanium enolate of an N-propionyloxazolidinone. The resulting lactone was reduced to give the C4–C6 stereotriad, with further selective reductions to differentiate the two termini and C20 as a protected acetal.