PROBLEM TO BE SOLVED: To provide processes for preparing inhibitors of the Janus Kinase family of protein tyrosine kinases (JAKs) for treatment of inflammatory diseases, myeloproliferative disorders and other diseases.SOLUTION: A process of synthesizing a compound represented by formula XII comprises reacting a compound represented by formula X with a compound represented by formula XIII in the presence of a Pd catalyst, a base, and a solvent. (Xis a tosylate group, a triflate group, iodo, chloro, or bromo; and Rand Rare each independently H or Calkyl, or Rand Rtogether with O and B form a 5- to 6-membered heterocyclic ring which is optionally substituted with 1-4 Calkyl groups; and Pand Pare each independently a protecting group.)SELECTED DRAWING: None【課題】炎症性疾患、骨髄増殖性障害および他の疾患の治療のためのヤヌスキナーゼファミリーのタンパク質チロシンキナーゼ(JAK)阻害剤の製造方法。【解決手段】Pd触媒、塩基及び溶媒の存在下で式Xで表される化合物を、式XIIIで表される化合物と反応させて、式XIIで表される化合物を合成する方法。(X2はトシラート基、トリフラート基、ヨード、クロロ又はブロモ;Rc及びRdは各々独立にH又はC1-6アルキル或いはRc及びRdは、O並びにBと一緒になって、4つのC1-4アルキル基で任意に置換5~6員複素環式環を形成1~;P1及びP2は各々独立に保護基)【選択図】なし