The present invention provides a process for producing (E)-N-monoalkyl-3-oxo-3-(2-thienyl)propenamine represented by Formula (1);
wherein R is a C
1-4
alkyl,
the method comprising the steps of:
maintaining a solution containing (Z)—N-monoalkyl-3-oxo-3-(2-thienyl)propenamine dissolved therein at 25° C. or below to deposit crystals and separating crystals having a particle diameter of 100 μm or less from the deposited crystals; and a process for producing (E,Z)—N-monoalkyl-3-oxo-3-(2-thienyl)propenamine comprising the steps of:
reacting an alkali metal salt of β-oxo-β-(2-thienyl)propanal with a monoalkylamine compound; adding a water-insoluble organic solvent to the resulting reaction mixture; adding seed crystals containing (E)-N-monoalkyl-3-oxo-3-(2-thienyl)propenamine to an organic layer obtained by conducting separation; and keeping the resulting mixture at 25° C. or below.
本发明提供了一种制备式(1)所表示的(E)-N-单烷基-3-氧代-3-(2-
噻吩基)
丙烯胺的方法;其中R是C1-4烷基,该方法包括以下步骤:在25℃或以下维持含有溶解的(Z)-N-单烷基-3-氧代-3-(2-
噻吩基)
丙烯胺的溶液以沉淀晶体,并从沉淀晶体中分离出粒径为100μm或以下的晶体;以及制备(E,Z)-N-单烷基-3-氧代-3-(2-
噻吩基)
丙烯胺的方法,包括以下步骤:将β-氧代-β-(2-
噻吩基)
丙醛的碱
金属盐与单烷基胺化合物反应;向所得反应混合物中加入
水不溶性有机溶剂;向通过分离得到的有机层中加入含有(E)-N-单烷基-3-氧代-3-(2-
噻吩基)
丙烯胺的种子晶体;并将所得混合物保持在25℃或以下。