A readily available and inexpensive natural &agr;-amino acid is converted into a compound represented by formula (1), which is then reacted with an organometallic reagent represented by formula (2) to give an optically active 5-hydroxyoxazolidine represented by formula (3), which is then treated with an acid to provide an optically active aminoketone represented by formula (4). The product is then converted into an optically active aminoalcohol represented by formula (5) or (6) by, for example reduction.
1
The above process can provide an optically active aminoalcohol represented by formula (5) or (6) useful as a production intermediate for a medicine or pesticide from a readily available and inexpensive natural &agr;-amino acid as a starting material stereoselectively and stably with a higher optical purity and a lower cost without racemization. This invention can also provide an optically active 5-hydroxyoxazolidine represented by formula (3) and an aminoketone represented by formula (4) as important intermediates for production of the above product as well as preparation processes therefor.
一种易得且廉价的天然
α-氨基酸被转化为式(1)所表示的化合物,然后与式(2)所表示的有机
金属试剂反应,得到式(3)所表示的光学活性5-羟基
噁唑烷,然后用酸处理,得到式(4)所表示的光学活性
氨基酮。然后,通过还原等方法将产物转化为式(5)或(6)所表示的光学活性
氨基醇。以上过程可以从易得且廉价的天然
α-氨基酸开始,具有高光学纯度和低成本的立体选择性和稳定性,提供用作药物或农药生产中间体的光学活性
氨基醇(式(5)或(6))。本发明还可以提供式(3)所表示的光学活性5-羟基
噁唑烷和式(4)所表示的
氨基酮,作为上述产品生产的重要中间体以及其制备过程。