昆虫性信息素的固相合成

本综述阐明昆虫性信息素固相合成的最新成就。C.C.Leznoff 开创了昆虫性信息素的固相合成,并合成了一系列信息素。他以二醇为原料,以聚合物三苯甲基氯为保护剂。陈德恒等将保护剂改成聚合物三苯甲基氯硅烷,产率比前人有所提高。陈家威等大大改进了前两人的线路,简化了步骤,只抓住关键的一步进行固相合成,总产率比前人提高得更多。     

Preparation of Polymer-Supported Chiral 1,2-Diamine as an Efficient Ligand for Asymmetric Hydrogenation Catalyst

An enantiopure 1,2-diamine having two phenolic hydroxy groups was synthesized, and attached to chloromethylated poly(styrene) through a benzyl ether linkage. The polymer-supported Ru precatalysts were prepared from the polymeric chiral 1,2-diamine and RuCl₂/BINAP complex. In the presence of t-BuOK the polymeric catalyst system worked well in asymmetric hydrogenation of aromatic ketones in a mixed solvent of 2-propanol and DMF. The insoluble polymeric catalyst was readily separated from the reaction mixture and reused at least several times without loss of the catalytic activity.