Iridium-Catalyzed Isomerization/Bromination of Allylic Alcohols: Synthesis of α-Bromocarbonyl Compounds
作者:Antonio Bermejo Gómez、Elis Erbing、María Batuecas、Ana Vázquez-Romero、Belén Martín-Matute
DOI:10.1002/chem.201402350
日期:2014.8.18
yields and with excellent selectivities. Starting from allylic alcohols as the carbonyl precursors, the combination of a 1,3‐hydrogen shift catalyzed by iridium(III) with an electrophilic bromination gives α‐bromoketones and aldehydes in good to excellent yields. The selectivity of the process is determined by the structure of the starting allylic alcohol; thus, α‐bromoketones formally derived from unsymmetrical
具有两个相邻亲电子碳原子的α-溴化酮和醛是有机合成中非常有价值的合成中间体,但是,它们由不对称酮合成的过程非常具有挑战性,当前的方法具有选择性低的缺点。我们提供了一种新的,可靠的,高效的合成α-溴羰基化合物的方法,该方法具有优异的收率和优异的选择性。从烯丙基醇作为羰基前体开始,铱(III)催化的1,3-氢转移与亲电溴化反应可很好地产生高纯度的α-溴代酮和醛。该方法的选择性由起始烯丙基醇的结构决定。因此,