A New Asymmetric Synthesis of (<i>R</i>)- and (<i>S</i>)-3-Arylphthalides: Extremely High Diastereoselective Reaction of Arylcarbaldehydes with Chiral [2-(1,3-Oxazolidin-2-yl)phenyl]titanium Ate Complexes
作者:Hiroshi Takahashi、Takeshi Tsubuki、Kimio Higashiyama
DOI:10.1055/s-1992-26199
日期:——
Chiral [2-(1,3-oxazolidin-2-yl)phenyl]titanium ate complexes are prepared from the corresponding lithium complexes, and the extremely high diastereoselective reaction of arylcarbaldehydes with the chiral titanium ate complexes is performed. Then, optically pure (R)- and (S)-3-arylphthalides are synthesized in favorable yields and the chiral auxiliary reagents are recovered with no less of the optical purity.
从相应的锂络合物中制备出手性[2-(1,3-恶唑啉-2-基)苯基]钛ae络合物,并使芳基羧醛与手性钛ae络合物发生极高的非对映选择性反应。然后,以良好的产率合成了光学纯度为(R)-和(S)-3-芳基邻苯二甲酸盐,并回收了光学纯度不低的手性辅助试剂。