Mild Deprotection of Methylene Acetals in Combination with Trimethylsilyl Triflate-2,2'-Bipyridyl
作者:Hiromichi Fujioka、Kento Senami、Ozora Kubo、Kenzo Yahata、Yutaka Minamitsuji、Tomohiro Maegawa
DOI:10.1248/cpb.58.426
日期:——
facile deprotection of methylene acetal protection of diols under mild conditions is established. The combination of trimethylsilyl triflate (TMSOTf) and 2,2'-bipyridyl followed by a weakly acidic hydrolysis was effective and the substrates having acid sensitive functional groups can be tolerated under the stated conditions. The selective deprotection between methylene acetal and benzophenone ketal
建立了在温和条件下二醇的亚甲基缩醛保护的轻松脱保护。三氟甲磺酸三甲基甲硅烷基酯(TMSOTf)和2,2'-联吡啶基的组合,然后进行弱酸性水解是有效的,并且在所述条件下可以耐受具有酸敏感性官能团的底物。在亚甲基缩醛和二苯甲酮缩酮之间实现了选择性的脱保护。