作者:Kristaps Leškovskis、Krista Gulbe、Anatoly Mishnev、Māris Turks
DOI:10.1016/j.tetlet.2020.152528
日期:2020.11
Methylenecyclopropanes (MCP) undergo ring opening reactions with group I and II metal halides and ammonium halides in liquid SO2 to afford homoallylic halides, which are versatile reagents in organic synthesis. The developed reaction conditions are compatible with acid-labile substrates such as N-Boc-protected compounds. Liquid SO2 is a polar reaction medium with Lewis acid properties that solubilizes
亚甲基环丙烷(MCP)与第一和第二族金属卤化物和卤化铵在液体SO 2中进行开环反应,得到均烯丙基卤化物,它们是有机合成中的通用试剂。所开发的反应条件与酸不稳定的底物如N -Boc保护的化合物相容。液体SO 2是具有路易斯酸性质的极性反应介质,可溶解无机盐。通过对照实验证明了SO 2的独特性质:1)在常规溶剂中与上述盐进行反应后,在催化量的H 3 PO 4(相似的pK)存在下也未观察到MCP开环a等于H 2 SO 3),或不存在H 3 PO 4;2)SO 2在THF中的溶液表现出与液体SO 2相似的性质。