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 C1-4 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.
本发明提供了一种生产式 (1) 所代表的 (E)-N- 单烷基-3-
氧代-3-(2-
噻吩基)
丙烯胺的工艺;
其中 R 为 C1-4 烷基、
该方法包括以下步骤
将含有溶解在其中的(Z)-N-单烷基-3-
氧代-3-(2-
噻吩基)
丙烯胺的溶液保持在 25℃或以下以沉积结晶,并从沉积结晶中分离出颗粒直径为 100 微米或以下的结晶;以及生产(E,Z)-N-单烷基-3-
氧代-3-(2-
噻吩基)
丙烯胺的工艺,包括以下步骤:
使 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;向生成的反应混合物中加入不溶于
水的有机溶剂;向通过传导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)
丙烯胺的籽晶;将生成的混合物保持在 25℃或以下。