Olefination with Sulfonyl Halides and Esters: Synthesis of Unsaturated Sulfonyl Fluorides
作者:Michał Tryniszewski、Dariusz Basiak、Michał Barbasiewicz
DOI:10.1021/acs.orglett.2c01604
日期:2022.6.17
addition of the carbanion, followed by cyclization–fragmentation of the four-membered ring intermediate. In the absence of base, electron-rich aldehydes follow an alternative pathway of the Knoevenagel condensation to provide unsaturated 1,1-disulfonyl fluorides. We demonstrate also trapping of elusive ethene-1,1-disulfonyl fluoride, CH2═C(SO2F)2, with 4-(dimethylamino)pyridine (DMAP) that forms zwitterionic
甲烷二磺酰氟,CH 2 (SO 2 F) 2 ,将芳香醛转化为β-芳基乙烯磺酰氟,这是SuFEx“点击”型转化的有用底物。该反应模仿霍纳-沃兹沃斯-埃蒙斯烯化反应的机制,通过添加碳负离子进行,然后进行四元环中间体的环化-断裂。在不存在碱的情况下,富电子醛遵循诺文格尔缩合的替代途径,生成不饱和的 1,1-二磺酰氟。我们还证明了用 4-(二甲氨基)吡啶 (DMAP) 捕获难以捉摸的乙烯-1,1-二磺酰氟 (CH 2 =C(SO 2 F) 2 ),形成两性离子加合物,并通过 X 射线研究进行表征。