H2TPP Organocatalysis in Mild and Highly Regioselective Ring Opening of Epoxides to Halo Alcohols by Means of Halogen Elements
作者:Parviz Torabi、Javad Azizian、Shahab Zomorodbakhsh
DOI:10.3390/molecules17055508
日期:——
found that elemental iodine and bromine are converted to trihalide nucleophiles (triiodine and tribromide anion, respectively) in the presence of catalytic amounts of meso-tetraphenylporphyrins (H2TPP). Therefore a highly regioselective method for the synthesis of beta-haloalcohols through direct ring opening of epoxides with elemental iodine and bromine in the presence of H2TPPs as new catalysts is described
我们发现,在催化量的内消旋四苯基卟啉(H2TPP)存在下,元素碘和溴转化为三卤化物亲核试剂(分别为三碘和三溴化物阴离子)。因此,描述了一种在 H2TPP 作为新催化剂的情况下,通过环氧化物与元素碘和溴的直接开环合成 β-卤代醇的高度区域选择性方法。在室温下,由于三卤化物阴离子原子攻击较少取代的碳原子,一系列环氧化物衍生物转化为相应的卤代醇。该方法在中性和温和的条件下发生,即使存在敏感的官能团,在各种非质子溶剂中也具有高产率。