作者:Cyrus Ohnmacht、Christopher Becker、Bruce Dembofsky、James Hall、Robert Jacobs、Don Pivonka
DOI:10.1055/s-2005-872122
日期:——
An efficient two-step preparation of (6R,7R)-6-hydroxy-7-phenyl-1,4-oxazepan-5-ones (1) starting from aminoethanols and (2R,3S)-3-phenyloxirane-2-carboxylic ethyl ester or potassium salt has been described. The most efficient catalyst identified for the ring closure of the resulting intermediate epoxyamides was Sc(OTf)3. By choice of appropriate chiral starting substituted aminoethanol and 3-phenyloxirane-2-carboxylic derivatives, the procedure allows facile synthesis of other single enantiomer 6-hydroxy-7-phenyl-1,4-oxazepan-5-ones.
报道了一种从氨基乙醇和(2R,3S)-3-苯基环氧乙烷-2-羧酸乙酯或钾盐出发,高效制备(6R,7R)-6-羟基-7-苯基-1,4-恶唑庚酮-5-酮(1)的两步法工艺。研究确定,对所得到的环氧酰胺中间体进行环合反应最有效的催化剂是Sc(OTf)3。通过选择适当的手性取代氨基乙醇和3-苯基环氧乙烷-2-羧酸衍生物作为起始原料,该方法能够方便地合成其他单一手性的6-羟基-7-苯基-1,4-恶唑庚酮-5-酮。