作者:Alejandro G. Barrado、Adam Zieliński、Richard Goddard、Manuel Alcarazo
DOI:10.1002/anie.201705851
日期:2017.10.16
A variety of terminal and internal alkynes were converted regio‐ and stereoselectively into (Z)‐3‐chloroacrylonitriles by treatment with BCl3 in the presence of stoichiometric amounts of imidazolium thiocyanates. These products could be readily functionalized to provide useful building blocks, thus demonstrating the synthetic value of the method. Preliminary mechanistic studies suggest initial activation
在化学计量的硫氰酸咪唑鎓存在下,通过用BCl 3处理,将各种末端和内部炔烃区域和立体选择性地转化为(Z)-3-氯丙烯腈。这些产品可以很容易地功能化,以提供有用的组成部分,从而证明了该方法的综合价值。初步的机理研究表明,路易斯酸会先活化阳离子硫氰酸盐,然后再对炔进行亲电攻击。氯离子向乙烯基阳离子中间体的顺式加成和硫脲单元的最终消除提供了所需的氯丙烯腈。