Tandem [4 + 2]/[3 + 2] Cycloadditions of Nitroalkenes. 13. The Synthesis of (−)-Detoxinine
作者:Scott E. Denmark、Alexander R. Hurd、Hubert J. Sacha
DOI:10.1021/jo962306n
日期:1997.3.1
(-)-Detoxinine, an unusual, highly-functionalized amino acid, is the core residue of many components that comprise the detoxin complex. The synthesis of(-)-detoxinine was accomplished in 10 steps and 13.4% overall yield from commercially available dichlorodiisopropylsilane. The key step is an asymmetric tandem inter [4 + 2]/intra [3 + 2] cycloaddition between silyoxynitroalkene 17 and chiral vinyl ether (-)-24, illustrating the application of a temporary silicon tether in the tandem nitroalkene cycloaddition process.
(-)-脱色素杆菌素是一种独特的多官能团氨基酸,它是 detoxin 复合物诸多组分的核心残基。其合成过程通过十步反应,以二氯二异丙基硅烷作为起始原料,最终获得了13.4%的总体产率。反应的关键步骤是利用硅氧基的乙烯基醚对硝基烯烃进行串联合环反应,即'4+2'加成反应和'3+2'加成反应,这一过程展现出硅基连接物在硝基烯烃串联合成中的巧妙应用。其合成路径的核心在于对硝基烯烃进行逻辑型协同合成。