Ru(II)-Catalyzed Cycloadditions of 1,6-Heptadiynes with Alkenes: New Synthetic Potential of Ruthenacyclopentatrienes as Biscarbenoids in Tandem Cyclopropanation of Bicycloalkenes and Heteroatom-Assisted Cyclocotrimerization of 1,6-Heptadiynes with Heterocyclic Alkenes
作者:Yoshihiko Yamamoto、Hideaki Kitahara、Ryuji Ogawa、Hiroyuki Kawaguchi、Kazuyuki Tatsumi、Kenji Itoh
DOI:10.1021/ja9942890
日期:2000.5.1
derivatives, furnishes the 1:2 adducts between the diynes and two molecules of the bicycloalkenes together with common [2 + 2 + 2] cyclocotrimerization products. The structure of a representative tandem 1:2 adduct between dimethyl dipropargylmalonate and 2,4-dimethylbicyclo[3.2.1]oct-6-en-3-one was unequivocally determined by X-ray analysis and was concluded to involve an unusual 1,2-dicyclopropylcyclopentene
钌 (II) 催化的 1,6-庚二炔与双环烯烃(例如双环 [3.2.1] 庚烯酮和降冰片烯衍生物)的串联环加成提供了二炔和双环烯烃的两个分子之间的 1:2 加合物以及常见的[2 + 2 + 2] 环三聚产物。通过 X 射线分析明确确定了二炔丙基丙二酸二甲酯和 2,4-二甲基双环 [3.2.1]oct-6-en-3-one 之间的代表性串联 1:2 加合物的结构,并得出结论涉及不寻常的 1, 2-二环丙基环戊烯骨架。在光谱类比的基础上,之前公布的二炔和降冰片烯衍生物之间串联环加合物的结构得到了纠正。由二炔形成串联双环丙烷化产物是相应的 2,4-金属环戊二烯中间体的双卡宾混合结构、1,3,5-金属环戊三烯的化学证据。形成串联环丙烷的选择性...