Remarkable Control of Radical Cyclization Processes of Cyclic Enyne: Total Syntheses of (±)-Methyl Gummiferolate, (±)-Methyl 7<i>β</i>-Hydroxykaurenoate, and (±)-Methyl 7-Oxokaurenoate and Formal Synthesis of (±)-Gibberellin A<sub>12</sub> from a Common Synthetic Precursor
作者:Masahiro Toyota、Masahiro Yokota、Masataka Ihara
DOI:10.1021/ja0035506
日期:2001.3.1
Totalsyntheses of (+/-)-methyl gummiferolate (13b), (+/-)-methyl 7beta-hydroxykaurenoate (14b), and (+/-)-methyl 7-oxokaurenoate (14d) and a formal synthesis of (+/-)-gibberellin A(12) (15) have been accomplished through the common synthetic precursor, (3aR,7aR)-3,3-dimethyl-7a-(2-propynyl)-3a,4,7,7a-tetrahydroisobenzofuranone (16). The homoallyl-homoallyl radical rearrangement reaction of the monocyclic