Photochemical type II reaction of atropchiral benzoylformamides to point chiral oxazolidin-4-ones. Axial chiral memory leading to enantiomeric resolution of photoproducts
作者:Josepha L. Jesuraj、J. Sivaguru
DOI:10.1039/c0cc00470g
日期:——
Atropisomeric benzoylformamides 1 undergo Type II reaction leading to cis-2 and trans-2 oxazolidin-4-one photoproducts. The N-C(Aryl) chiral axis is maintained during the course of the phototransformation in spite the reaction proceeding through a near planar intermediate(s). As the rotational barrier of the N-C(Aryl) chiral axis in the cis-2 and trans-2 photoproducts is lowered when compared with
阻转异构的苯甲酰基甲酰胺1发生II型反应,导致顺2和反2恶唑烷丁4-1光产物。尽管反应通过接近平面的中间体进行,但在光转化过程中仍保持NC(芳基)手性轴。与反应物1相比,由于顺式2和反式2光产物中NC(芳基)手性轴的旋转势垒降低,分离出的旋光纯反式2异构体转化为对映体2顺式异构体,而没有会影响C-5立体中心,从而导致顺式2对映异构体的拆分。