Alkyldisulfanium Salts: Isolable, Electrophilic Sulfur Reagents Competent for Polyene Cyclizations
作者:Florian T. Schevenels、Minxing Shen、Scott A. Snyder
DOI:10.1021/acs.orglett.6b02059
日期:2017.1.6
sulfur-promoted cation−π cyclizations are generally lacking, especially using alkylsulfide-based reagents. Herein we report that combining three different 1,2-dithioethers with Cl2 and SbCl5 generates isolable alkyldisulfanium salts that can effect such reactions. These new reagents can install −SMe, −SEt, and −SCH2CH2CF3 in modest, moderate, or good yield on diverse frameworks, including polyenes that terminate
通常缺乏能实现亲电性硫促进的阳离子-π环化的工具,尤其是使用基于烷基硫的试剂时。在此,我们报道了将三种不同的1,2-二硫醚与Cl 2和SbCl 5结合产生可分离的烷基二硫鎓盐,该盐可实现此类反应。这些新试剂可以在各种构架(包括以缺电子基团终止的多烯)上以适度,中等或良好的产率安装-SMe,-SEt和-SCH 2 CH 2 CF 3。我们还表明,诸如四氟硼酸二甲基(甲硫基)s(DMTSF)的试剂可以完成相似的化学反应。