PROBLEM TO BE SOLVED: To provide an efficient production method for a compound that is a rosuvastatin calcium intermediate.SOLUTION: The production method has a step for the condensation of a compound represented by formula (I) and a compound represented by formula (II): NCCH2COOR(II) in the presence of a catalyst [where R is a hydrogen atom, an optionally branched, lower alkyl group, an allyl group, an optionally substituted phenyl group, an optionally substituted benzyl group or an optionally substituted heterocycle], followed by the decarboxylation of it in the presence or absence of a base.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】ロスバスタチンカルシウム中間体である化合物の高効率的な製造方法の提供。【解決手段】該製造方法は、式（Ｉ）：で表される化合物と式（ＩＩ）：ＮＣＣＨ２ＣＯＯＲ（ＩＩ）［Ｒは水素原子、分岐しても良い低級アルキル基、アリル基、置換基を有しても良いフェニル基、置換基を有しても良いベンジル基又は置換基を有しても良い複素環を示す。］で表される化合物の触媒存在下での縮合、次いで塩基存在下あるいは非存在下で脱炭酸する工程、を含む。【選択図】なし
