Regiochemical control of the ring opening of 1,2-epoxides by means of chelating processes.9. Synthesis and ring opening reactions of cis- and trans-oxides derived from 3-(benzyloxymethyl)cyclopentene and methyl 2-cyclopenten-1-carboxylate 1
作者:Marcello Colombini、Paolo Crotti、Valeria Di Bussolo、Lucilla Favero、Cristina Gardelli、Franco Macchia、Mauro Pineschi
DOI:10.1016/0040-4020(95)00425-8
日期:1995.7
The regiochemical outcome of the ring opening of 1,2-epoxides through chelation processes assisted by metal ions, was verified in the oxirane systems derived from cyclopentene bearing a polar functionality (CH2OBn or COOMe) in a homoallylic relationship to the oxirane ring. The cis/trans diastereoisomeric epoxide pairs 7–8 and 9–10 derived from 3-(benzyloxymethyl)cyclopentene and methyl 2-cyclopenten-1-carboxylate
1,2-环氧化物在金属离子的辅助下通过螯合过程开环的区域化学结果,在环氧乙烷体系中得到了证实,该环氧乙烷体系衍生自带有极性官能团(CH 2 OBn或COOMe)的环戊烯,与环氧乙烷环呈均烯丙基关系。分别制备了分别由3-(苄氧甲基)环戊烯和2-环戊烯-1-羧酸甲酯衍生的顺式/反式非对映异构体环氧对7-8和9-10。观察到的区域选择性取决于打开反应规程(标准或金属辅助),表明在适当条件下螯合二齿螯合物在打开过程中的有效侵入。