Difluorocarbene-based [4 + 1] Cycloaddition Strategy for Synthesizing Derivatives of 5-Fluorinated Thiazoles and Oxazoles
作者:Kohei Fuchibe、Yuki Morota、Takaya Miura、Junji Ichikawa
DOI:10.1246/cl.220212
日期:2022.7.5
treated with difluorocarbene, which was generated from FSO2CF2CO2SiMe3 with a 1,8-bis(dimethylamino)naphthalene catalyst, N-(thioacyl)amidines underwent [4 + 1] cycloaddition to afford the corresponding amino-substituted 5,5-difluorothiazolines. Both dehydrofluorination and a Hofmann elimination/SN2′-type reaction sequence enabled the aromatization of the obtained products, affording 5-fluorothiazoles
当用二氟卡宾(由 FSO 2 CF 2 CO 2 SiMe 3和 1,8-双(二甲氨基)萘催化剂生成)处理时,N-(硫代酰基)脒经历 [4 + 1] 环加成反应得到相应的氨基取代5,5-二氟噻唑啉。脱氟化氢和霍夫曼消除/S N 2' 型反应序列都能够芳构化所得产物,得到 5-氟噻唑。[4 + 1] 环加成策略也适用于N-酰基脒,得到相应的 5-氟恶唑衍生物。