General Protocols for the Synthesis of <i>C</i><sub>2</sub>-Symmetric and Asymmetric 2,8-Disubstituted Analogues of Tröger's Base via Efficient Bromine−Lithium Exchanges of 2,8-Dibromo-6<i>H</i>,12<i>H</i>-5,11-methanodibenzo[<i>b</i>,<i>f</i>][1,5]diazocine
作者:Jacob Jensen、Johan Tejler、Kenneth Wärnmark
DOI:10.1021/jo025823g
日期:2002.8.1
Methods for facile synthesis of symmetric and unsymmetric functionalized analogues of Tröger's base were developed with use of 2,8-dibromo-6H,12H-5,11-methanodibenzo[b,f][1,5]diazocine (2) as the starting material. C(2)-symmetric 2,8-disubstituted analogues of Tröger's base (4a-f) were synthesized via double bromine-lithium exchange of 2 followed by quench with electrophiles. Desymmetrization via single
以2,8-二溴-6H,12H-5,11-甲基二苯并[b,f] [1,5]重氮(2)为起始原料,开发了用于合成Tröger碱的对称和不对称功能化类似物的方法材料。Tröger碱(4a-f)的C(2)对称2,8-二取代类似物是通过双溴-锂交换2,然后用亲电试剂淬灭来合成的。通过2的溴-锂交换进行去对称,然后用亲电试剂淬灭,得到Tröger碱的不对称类似物(6a-g)。2-溴-8-(三甲基甲硅烷基)-6H,12H-5,11-甲基二苯并[b,f] [1,5]二重氮(6b)的进一步反应通过一次溴-锂交换产生7a-c,随后用亲电试剂。