Synthesis of 4- and 5-substituted 10-oxatricyclo[5.2.l.02,6]decadienones. Functionalization of the cyclo-adduct of furan and cyclopenten-1,4-dione.
作者:Adrie A.M. Houwen-Claassen、A.J.H. Klunder、M.G. Kooy、J. Steffann、B. Zwanenburg
DOI:10.1016/s0040-4020(01)89179-1
日期:——
Tosylmethylation of the furan derived cyclo-adduct of cyclopentene-1,4-dione, followed by O-ethylation, leads to 5-ethoxy-4-(p-tolylsulphonyl)methyl-exo-10-oxatricyclo[5.2.1.02,6]deca-4,8-d ien-3-one 14. This sulphone undergoes a smooth displacement of the tosyl group by an ether or thioether function when treated with alcoholates or thiolates. This displacement involves two consecutive SN2′ substitutions
环戊烯-1,4-二酮的呋喃衍生环加合物,接着O形乙基化,引线的Tosylmethylation 5-乙氧基-4-(p -tolylsulphonyl)甲基-外-10-氧杂三环[5.2.1.0 2,6 ] deca-4,8-d ien-3-one 14。当用醇盐或硫醇盐处理时,该砜通过醚或硫醚官能团对甲苯磺酰基进行平滑置换。该位移包括两个连续的小号Ñ 2'取代,发生立体专一性的至少受阻外底物分子的面取向,即,反到氧杂桥。随后用DIBAL还原或与MeLI反应得到4-和/或5-取代的10-氧三环[5.2.1.0 2,6]十二烯。