Palladium catalyzed stereospecific allylic substitution of 5-acetoxy-2(5H)-furanone and 6-acetoxy-2H-pyran-3(6H)-one by alcohols
作者:Hanneke van der Deen、Arjan van Oeveren、Richard M. Kellogg、Ben L. Feringa
DOI:10.1016/s0040-4039(98)02683-5
日期:1999.2
Enantiomerically pure 5-acetoxy-2(5H)-furanone and 6-acetoxy-2H-pyran-3(6H)-one are converted into 5-alkoxy-2(5H)-furanones and 6-alkoxy-2H-pyran-3(6H)-ones by a palladium catalyzed allylic substitution. The reactions proceed with nearly complete retention of configuration, resulting in products with ee's of 95%.
对映体纯的5-乙酰氧基-2(5 H)-呋喃酮和6-乙酰氧基-2 H-吡喃-3(6 H)-酮被转化为5-烷氧基-2(5 H)-呋喃酮和6-烷氧基-2 H-吡喃3(6 H)-通过钯催化的烯丙基取代。反应在进行过程中几乎完全保留了构型,从而得到ee值为95%的产品。