Catalyst-Controlled Inverse-Electron-Demand Hetero-Diels−Alder Reactions in the Enantio- and Diastereoselective Synthesis of Iridoid Natural Products
作者:David E. Chavez、Eric N. Jacobsen
DOI:10.1021/ol034883l
日期:2003.7.1
[reaction: see text] Iridoid natural products 1-4 are accessed stereoselectively by means of tridentate (Schiff base)Cr(III)-catalyzed hetero-Diels-Alder reactions between ethyl vinyl ether and enantioenriched 5-methyl-1-cyclopentene-1-carboxaldehyde. An efficient route to the aldehyde from citronellal is afforded by the ring-closing metathesis reaction.
[反应:参见正文]通过三齿(席夫碱)Cr(III)催化的乙基乙烯基醚与对映体富集的5-甲基-1-环戊烯-1之间的杂Diels-Alder反应,立体选择性地获得类虹彩天然产物1-4 -甲醛。闭环易位反应提供了从香茅醛到醛的有效途径。