Chemoselective and Direct Functionalization of Methyl Benzyl Ethers and Unsymmetrical Dibenzyl Ethers by Using Iron Trichloride
作者:Yoshinari Sawama、Ryota Goto、Saori Nagata、Yuko Shishido、Yasunari Monguchi、Hironao Sajiki
DOI:10.1002/chem.201303910
日期:2014.2.24
tertiary benzylic positions of methyl benzyl ethers or unsymmetrical dibenzyl ethers and is also applicable to direct allylation, alkynylation, and cyanation reactions, as well as the azidation. The present methodologies provide not only a novel chemoselectivity but also the advantage of shortened synthetic steps, due to the direct process without the deprotection of the methyl and benzyl ethers.
甲基和苄基醚由于其化学稳定性,例如在亲核条件下作为离去基团的甲氧基和苄氧基的反应性低而被广泛用作受保护的醇。我们已经建立了衍生自仲和叔苄醇的化学稳定的甲基和苄基醚的直接叠氮化反应。本发明的叠氮化化学选择地在甲基苄基醚或不对称二苄基醚的仲或叔苄基位置进行,并且还可用于直接烯丙基化,炔化和氰化反应以及叠氮化。本发明的方法不仅提供新颖的化学选择性,而且由于直接方法而没有对甲基和苄基醚进行脱保护,因此提供了缩短的合成步骤的优点。