Catalytic Enantioselective Synthesis of Chiral Tetraphenylenes: Consecutive Inter- and Intramolecular Cycloadditions of Two Triynes
作者:Takanori Shibata、Tatsuya Chiba、Hiroyuki Hirashima、Yasunori Ueno、Kohei Endo
DOI:10.1002/anie.200903715
日期:2009.10.12
Triynes having a phenylene‐bridged 1,5‐diyne moiety were transformed into substituted tetraphenylenes by the title sequence. A cationic Rh–ligand species catalyzed this highly enantioselective reaction. This protocol is a new and easy approach to the construction of the tetraphenylene skeleton and enables an efficient asymmetric synthesis (see scheme; R=H; Z=NTs, C(CO2Me)2, O).
具有亚苯基桥接的1,5-二炔部分的三炔通过标题序列转化为取代的四亚苯基。阳离子Rh-配体物种催化了这种高度对映选择性的反应。该协议是一种构造四亚苯基骨架的新方法,可轻松实现高效的不对称合成(请参见方案; R = H; Z = NTs,C(CO 2 Me)2,O)。