The invention relates to a compound which is, 2-[4-[(methylamino)carbonyl]-1H-pyrazol-1-yl]adenosine, which is a selective A2A adenosine receptor agonist in myocardial imaging. The new polymorph of 2-[4-[(methylamino)carbonyl]-1H-pyrazol-1-yl]adenosine (designated as polymorph E) is characterized by an X-ray diffraction pattern of X-RPD showing the following reflections at 2 Theta=5.8°, 12.3°, 15.9°, 17.3°, 20.5°, 22.6°, 23.6°, 27.7°, and 29.2°; and further characterized by a DSC scan showing marked endotherm in the range of 258 to 264° C.; and further characterized by a specific IR spectra. The invention further relates to a method of preparing the polymorph by recrystallization from other polymorphic forms of 2-[4-[(methylamino)carbonyl]-1H-pyrazol-1-yl]adenosine by a procedure comprising the following operations: mixing of 2-[4-[(methylamino)carbonyl]-1H-pyrazol-1-yl]adenosine with a polar aprotic solvent, preferably with dimethylsulfoxide, and heating to form a saturated solution; cooling of the saturated solution with formation of a turbid solution of 2-[4-[(methylamino)carbonyl]-1H-pyrazol-1-yl]adenosine; addition of the turbid solution of 2-[4-[(methylamino)carbonyl]-1H-pyrazol-1-yl]adenosine to a protic solvent, preferably methanol, with separation of a gel-like precipitate; heating of the separated gel-like precipitate in the protic solvent to a boil with formation of a suspension of polymorph E; and cooling of the suspension, isolation and drying of polymorph E.
本发明涉及一种化合物,即2-[4-[(甲基
氨基)羰基]-1H-
吡唑-1-基]
腺苷,是一种选择性A2A
腺苷受体激动剂,用于心肌成像。2-[4-[(甲基
氨基)羰基]-1H-
吡唑-1-基]
腺苷的新晶型(指定为E晶型)的X射线衍射图样表现为在2Theta=5.8°,12.3°,15.9°,17.3°,20.5°,22.6°,23.6°,27.7°和29.2°处有以下反射;并且通过
DSC扫描表现出在258到264℃范围内明显的吸热;并且通过特定的红外光谱表现出特征。本发明还涉及通过从2-[4-[(甲基
氨基)羰基]-1H-
吡唑-1-基]
腺苷的其他多晶形式中重结晶的方法来制备该多晶型,包括以下步骤:将2-[4-[(甲基
氨基)羰基]-1H-
吡唑-1-基]
腺苷与极性无
水溶剂(优选为
二甲基亚砜)混合并加热形成饱和溶液;冷却饱和溶液,形成2-[4-[(甲基
氨基)羰基]-1H-
吡唑-1-基]
腺苷的混浊溶液;将混浊溶液加入质子溶剂(优选为
甲醇)中,分离出凝胶状沉淀;将分离出的凝胶状沉淀在质子溶剂中加热至沸腾,形成E晶型的悬浮液;冷却悬浮液,分离和干燥E晶型。