Cycloaddition of nitrones to 1,3-diarylpropenones and subsequent transformations of the resulting isoxazolidines
作者:Ekaterina V. Sirotkina、Mariia M. Efremova、Galina L. Starova、Mikhail A. Kuznetsov、Alexander P. Molchanov
DOI:10.1007/s10593-020-02797-z
日期:2020.9
regio- and stereoselectively with 1,3-diarylpropenones to form isoxazolidines with ester groups at position 3 of the ring. The action of zinc in acetic acid on these isoxazolidines causes opening of the ring with the formation of 3-amino alcohols, the subsequent cyclization of which leads to polysubstituted lactones. Reduction of the benzoyl group of isoxazolidine with sodium borohydride leads, as a
含有两个酯基的酮硝基酮与1,3-二芳基丙烯酮进行区域选择性和立体选择性反应,形成在环的3位带有酯基的异恶唑烷。乙酸中锌对这些异恶唑烷的作用导致开环,形成3-氨基醇,其后环化形成多取代的内酯。硼氢化钠还原异恶唑烷的苯甲酰基,由于随后的转化,导致形成取代的1,3,4-三芳基-6-恶二氢-1 H,3 H-呋喃[3,4- c ]异恶唑-6a(6 H)-羧酸盐为单一非对映异构体。