The diastereoselective synthesis of the simplest member of the scopadulan diterpenes, (-)-thyrsiflorin A methyl ester 10 from chiral (+)-podocarp-8(14)-en-13-one 1, of known absolute configuration, is described. A key step in our synthesis is the intramolecular cyclopropanation of the diazoketone 5 and subsequent regioselective cleavage of the cyclopropane ring.
First Diastereoselective Synthesis of (−)-Methyl Thyrsiflorin A, (−)-Methyl Thyrsiflorin B Acetate, and (−)-Thyrsiflorin C
作者:Manuel Arnó、Miguel A. González、M. Luisa Marín、Ramón J. Zaragozá
DOI:10.1021/jo991561f
日期:2000.2.1
An efficient procedure for the synthesis of scopadulan diterpenes, using (+)-podocarp-8(14)-en-13-one 13 as starting material, is reported. This procedure has been used for the diastereoselective synthesis of (-)-methyl thyrsiflorin A (8), (-)-methyl thyrsiflorin B acetate (9), and (-)-thyrsiflorin C (7). Key steps in our strategy are the intramolecular cyclopropanation of diazoketone 19 and the regioselective