Applications of Phthalimide Photochemistry to Macrocyclic Polyether, Polythioether, and Polyamide Synthesis
作者:Ung Chan Yoon、Sun Wha Oh、Jae Ho Lee、Jong Hoon Park、Kyung Tae Kang、Patrick S. Mariano
DOI:10.1021/jo001457u
日期:2001.2.1
polythioether, and polysulfonamide products. These photocyclization reactions follow sequential single electron transfer (SET)-desilylation pathways. Only in the cases of phthalimides, bearing mixed ether-thioether N-substituents, do these excited-state cyclization reactions proceed with lower degrees of regioselectivity. This is a result of competitive desilylation and alpha-to-sulfur deprotonation reactions
辐照包含N-连接的ω-三甲基甲硅烷基甲基取代的聚醚,聚硫醚和聚磺酰胺链的邻苯二甲酰亚胺可有效生产相应的大环聚醚,聚硫醚和聚磺酰胺产品。这些光环化反应遵循顺序的单电子转移(SET)-去甲硅烷基化途径。仅在带有混合的醚-硫醚N-取代基的邻苯二甲酰亚胺的情况下,这些激发态环化反应才会以较低的区域选择性进行。这是由初始SET形成的两性离子双自由基中间体发生竞争性甲硅烷基化和α-硫脱质子反应的结果。