The asymmetric cycloaddition of TIPS nitronate catalyzed by “Cu(II)-bisoxazoline” gave the 2-isoxazoline product in 95% yield, which was converted into tert-butyl (3S,5R)-6-hydroxy-3,5-O-isopropylidene-3,5-dihydroxyhexanoate in 14 steps through a β-hydroxy ketone.
TIPS硝酸酯的不对称环加成反应在“Cu(II)-双
噁唑啉”催化下,产率为95%得到2-
异噁唑醇产物,经过14步转化成(3S,5R)-6-羟基-3,5-O-异丙基-3,5-二羟基
己酸叔丁酯,中间通过β-羟基酮。