Ring expansion of cyclic 1,2-diols to form medium sized rings via ruthenium catalyzed transfer hydrogenative [4+2] cycloaddition
作者:Zachary A. Kasun、Laina M. Geary、Michael J. Krische
DOI:10.1039/c4cc03983a
日期:——
A new method for the ring expansion of cyclic diols is described. Using improved conditions for the ruthenium(0) catalyzed cycloaddition of cyclic 1,2-diols with 1,3-dienes, fused [n.4.0] bicycles 3a–3r (n = 3–6) are formed, which upon exposure to iodosobenzene diacetate engage in oxidative cleavage to form the 9–12 membered rings 4a–4r.
描述了一种环扩展环状二醇的新方法。通过改进的条件,使得环状1,2-二醇与1,3-二烯在钌(0)催化的环加成反应中形成融合的[n.4.0]自行车3a-3r(n = 3-6),这些产物在与碘苯二乙酸接触后发生氧化开裂,生成9-12成员的环4a-4r。