1,3-Diyl trapping reactions. Fundamental investigations with application to the synthesis of linearly fused tricyclopentanoids
作者:R.Daniel Little、George W. Muller、Manuel G. Venegas、Gary L. Carroll、Ahmed Bukhari、Larry Patton、Keith Stone
DOI:10.1016/0040-4020(81)80003-8
日期:1981.1
no practical effect upon the outcome of the trapping reaction. The intramolecular process is stereospecific with respect to diylophile geometry, and highly stereoselective with respect to the ring junction stereochemistry. Finally, an abortive attempt to synthesize the marine natural product Δ9(12)-capnellene (19) as well as a successful synthesis of the mold metabolite d,l- hirsutene (18) is presented
比较了分子间和分子内二芳基捕获途径与线性稠合的三环戊烷的关系。另外,检查了与分子内过程有关的几种影响立体选择性的因素,并得出结论,构象而非电子(次级轨道)因素起主要作用。结果表明,位于无环链上的宝石甲基连接了二基和亲二烯基(指32和35,但不包括47)对诱捕反应的结果没有实际影响。分子内过程相对于亲二烯体几何形状是立体定向的,并且对于环结立体化学是高度立体选择性的。最后,提出了合成海洋天然产物Δ9 (12)-capnellene(19)的失败尝试,以及霉菌代谢产物d,l -hirsutene(18)的成功合成。