Cycloadditions of Allylsilanes - Part 22.¹ Stereoselective Synthesis of Cyclopentanes and Cyclobutanes by Lewis Acid Promoted [3+2] and [2+2] Cycloadditions of Allylsilanes
作者:Hans-Joachim Knölker、Arndt Schmidt
DOI:10.1055/s-0030-1258549
日期:2010.9
Lewis acid promoted [3+2] and [2+2] cycloadditions as a novel methodology for the stereoselective construction of cyclopentanes and cyclobutanes is described. Elegant applications of this methodology to the total synthesis of biologically active terpenoid natural products are presented. 1 Introduction 2 [3+2] Cycloadditions of Allylsilanes 2.1 Synthesis of Silylbicyclo[n.3.0]alkanes 2.2 Synthesis of Silylcyclopentanes
A stereoselective total synthesis of the monoterpenoid alcohol (±)-fragranol has been accomplished utilizing a TiCl4 promoted [2 + 2] cycloaddition of allyl-tert-butyldiphenylsilane and methyl methacrylate as the key step.