Boron fluoride promoted cleavage of acetals by organocopper reagents application to asymmetric synthesis
作者:J.F. Normant、A. Alexakis、A. Ghribi、P. Mangeney
DOI:10.1016/0040-4020(89)80078-x
日期:1989.1
BF3. Et2O, organocopper and cuprate reagents promote the substitution of one alkoxy group of an acetal. Under the same conditions, alkoxy tetrahydropyrans react selectively, by ring cleavage. Chiral cyclic acetals, having a C2 axis of symmetry are diastereoselectively cleaved. The method serves to synthesize chiral secondary alcohols, after the removal of the chiral auxiliary.
在BF 3存在下。Et 2 O,有机铜和铜酸盐试剂可促进缩醛中一个烷氧基的取代。在相同条件下,烷氧基四氢吡喃通过环裂解选择性地反应。具有C2对称轴的手性环状缩醛被非对映选择性地裂解。除去手性助剂后,该方法用于合成手性仲醇。