According to the present invention, differently from well-known production methods, with the use of a different starting material, Ullmann condensation which may decrease the yield with an increase of a production scale can be avoided and thus 6-amino-9-[(3R)-1-(2-butynoyl)-3-pyrrolidinyl]-7-(4-phenoxyphenyl)-7,9-dihydro-8H-purin-8-one can be provided safely and stably with high reaction yield.
根据本发明,与众所周知的生产方法不同,通过使用不同的起始原料,可以避免随着生产规模的扩大而降低产率的乌尔曼缩合反应,从而可以安全稳定地提供高反应产率的 6-
氨基-9-[(3R)-1-(
2-丁炔酰基)-3-
吡咯烷基]-7-(4-苯氧基苯基)-7,9-二氢-8H-
嘌呤-8-酮。