1-Trifluoromethylisoquinolines from α-Benzylated Tosylmethyl Isocyanide Derivatives in a Modular Approach
摘要:
The preparation of various 1-triftuoromethyli-soquinolines from alpha-benzylated tosylmethyl isotyanide derivatives and the commercial Togni reagent using a radical cascade is reported. The starting isocyanides are readily prepared in a modular sequence from commercial tosylmethyl isocyanide via sequential double a-alkylation, and the radical reaction proceeds under mild conditions, with high efficiency without any transition-metal catalyst via electron catalysis. This valuable protocol has been successfully applied to the total synthesis of CF3-mansouramycin B.
高效合成取代的吡唑并嘧啶,例如吡啶并[3',2':4,5]吡咯并[1,2- c ]嘧啶,嘧啶并[1,6- a ]吲哚,苯并[4,5]咪唑并[1]描述了,2- c ]嘧啶,咪唑并[1,2- c ]嘧啶和吡唑并[1,5- c ]嘧啶。该方法涉及在无水介质中N保护的溴甲基唑与甲苯磺酰基甲基异氰化物(TosMIC)衍生物的反应。对反应条件的研究表明,该方法仅在使用苄基三乙基氯化铵作为催化剂的相转移条件下(CH 2 Cl 2 /30%NaOH水溶液)成功。