An efficient synthesis of 5-silyl-2,3-dihydrofurans via acid-catalyzed ring-enlargement of cyclopropyl silyl ketones and their functionalization
作者:Mitsunori Honda、Tomoyuki Naitou、Hiromitsu Hoshino、Seiji Takagi、Masahito Segi、Tadashi Nakajima
DOI:10.1016/j.tetlet.2005.08.117
日期:2005.10
Treatment of cyclopropyl silyl ketones with trimethylsilyl trifluoromethanesulfonate as a strong acid having low nucleophilic counter anion gives the corresponding 5-silyl-2,3-dihydrofuran derivatives, exclusively, regardless of substituents on the cyclopropane ring or silicon atom. The resulting 5-silyl-2,3-dihydrofuran derivatives exhibit both reactivities of the vinylsilane and the cyclic enol ether in the
用三氟甲磺酸三甲基甲硅烷基酯作为具有低亲核抗衡阴离子的强酸处理环丙基甲硅烷基酮,仅得到相应的5-甲硅烷基-2,3-二氢呋喃衍生物,而与环丙烷环或硅原子上的取代基无关。所得的5-甲硅烷基-2,3-二氢呋喃衍生物在随后与亲电试剂的反应或Heck型反应中表现出乙烯基硅烷和环状烯醇醚的反应性。