Highly Enantioselective Construction of a Chiral Spirocyclic Structure by the [2 + 2 + 2] Cycloaddition of Diynes and <i>exo</i>-Methylene Cyclic Compounds
作者:Kyoji Tsuchikama、Yusuke Kuwata、Takanori Shibata
DOI:10.1021/ja064257u
日期:2006.10.1
The enantioselective [2 + 2 + 2] cycloaddition of 1,6-diynes with alpha-methylene lactones and cyclic ketones gave various chiral spirocyclic compounds. The reaction proceeded with high enantioselectivity when the rhodium-xylylBINAP complex was used as a chiral catalyst. Not only exo-methylene cyclic compounds but also exo-methylene acyclic compounds could be used as coupling partners for diynes. The
1,6-二炔与α-亚甲基内酯和环酮的对映选择性[2+2+2]环加成得到各种手性螺环化合物。当铑-二甲苯基BINAP配合物用作手性催化剂时,反应以高对映选择性进行。不仅外型亚甲基环状化合物而且外型亚甲基无环化合物都可以用作二炔的偶联伙伴。本协议提供对具有四元碳中心(包括螺环系统)的新手性库的访问。