2-Trimethylsilylethyl Sulfides in the von Braun Cyanogen Bromide Reaction: Selective Preparation of Thiocyanates and Application to Nucleoside Chemistry
作者:Stéphane Chambert、François Thomasson、Jean-Luc Décout
DOI:10.1021/jo016200q
日期:2002.3.1
Mixed 2-(trimethylsilyl)ethyl sulfides were synthesized and used in the von Braun cyanogen bromide reaction for preparing selectively thiocyanates in high yield. We show here that this cleavage reaction is highly selective in methanol in comparison with the reaction of the corresponding non-silyl sulfide analogues. This reaction was applied to the synthesis of nucleosidic thiocyanates such as the new
合成了混合的2-(三甲基甲硅烷基)乙基硫醚,并将其用于von Braun溴化氰反应中,可高产率选择性地制备硫氰酸盐。我们在这里表明,与相应的非甲硅烷基硫醚类似物的反应相比,这种裂解反应在甲醇中具有很高的选择性。该反应用于合成核苷硫氰酸盐,例如新的核苷14和18,以寻找基于机制的核糖核苷二磷酸还原酶和生物活性分子抑制剂。对于带有羟基官能团和芳环的硫化物来说,选择性裂解是可能的。在相同条件下首次观察到溴化氰氰化和溴化剂与萘氧基己基2-三甲基甲硅烷基乙基硫化物7的反应,用溴化氰在二氯甲烷中处理,选择性地得到对溴萘氧基乙氧基硫氰酸酯10,产率为89%。在二氯甲烷中观察到由溴化氰引发的另一种反应与2-(三甲基甲硅烷基乙基)硫代核苷13,从而以良好的收率得到了相应的对称二硫化物21。