Synthesis of Polyether Cyclophanes through Rhodium-Catalyzed Cross-Alkyne Cyclotrimerization
作者:Ken Tanaka、Hiromi Sagae、Kazuki Toyoda、Keiichi Noguchi
DOI:10.1002/ejoc.200600232
日期:2006.8
complex give [7]–[21]polyether cyclophanes in good yield. [8]–[9]Ester cyclophanes were also synthesized from the corresponding α,ω-diynes. The ratio of para-, meta-, and orthocyclophanes depends on the length and the structure of the α,ω-diyne tether chain, whilst the effect of concentration on the yield of polyether cyclophanes appears to be small. X-ray analysis revealed that a single crystal of [15]metacyclophane
在催化量的阳离子铑 (I)/H8-BINAP 配合物存在下,醚连接的 α,ω-二炔和乙炔二甲酸二甲酯的交叉环三聚反应以良好的收率得到 [7]-[21] 聚醚环芳烃。[8]–[9]酯环芳烃也由相应的α,ω-二炔合成。对-、间-和邻环芳烃的比例取决于 α,ω-二炔系链的长度和结构,而浓度对聚醚环芳烃产率的影响似乎很小。X 射线分析表明,[15]metacyclophane 4g 的单晶是手性形式,[5.5]metacyclophane 4k 的单晶是外消旋形式,因为晶体中没有环翻转。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)