Total Synthesis of (−)-Mitrephorone A Enabled by Stereoselective Nitrile Oxide Cycloaddition and Tetrasubstituted Olefin Synthesis
作者:Michael Schneider、Matthieu J. R. Richter、Erick M. Carreira
DOI:10.1021/jacs.0c09520
日期:2020.10.14
highly enantioselective and diastereoselective totalsynthesis of the diterpenoid (−)-mitrephorone A is presented. Key to the synthesis are stereocontrolled 1,4-semihydrogenation of a 1,3-diene to a tetrasubstituted double bond, enzyme-catalyzed malonate desymmetrization, and highly diastereoselective nitrile oxide cycloaddition. The streamlined strategy is a considerable improvement to those reported
提出了二萜 (-)-mitrephorone A 的高度对映选择性和非对映选择性全合成。合成的关键是立体控制的 1,3-二烯 1,4-半氢化生成四取代双键、酶催化丙二酸去对称化和高度非对映选择性的氧化腈环加成反应。在非对映选择性和对映选择性方面,简化的策略比之前报道的策略有了相当大的改进。现代 Pd 交叉偶联与 Cr 催化还原的结合首次允许快速获得具有完全立体控制的四取代烯烃。
LUYTEN, M.;MULLER, S.;HERZOG, B.;KEESE, R., HELV. CHIM. ACTA, 70,(1987) N 5, 1250-1254