Reactions of 6-amino-1,3-dimethyluracil with substituted α-ketoalkynes using homogeneous nickel catalyst in aqueous alkaline medium, afford substituted 2,4-dioxopyrido[2,3-d]pyrimidine derivatives in quantitative yields under very mild conditions. A mechanism has been proposed for the reactioninvolving the nucleophilic attack of Ni(0) anion, formed in situ onto the triple bond of the substrate. All
的反应 6-氨基-1,3-二甲基尿嘧啶 用均相镍取代的α-酮炔 催化剂在碱性水溶液中,在非常温和的条件下,以定量收率得到取代的2,4-二氧吡喃并[2,3- d ]嘧啶衍生物。已经提出了一种涉及Ni(0)阴离子的亲核攻击的反应机理,该Ni(0)阴离子原位形成在底物的三键上。全部合成嘧啶类 被很好地表征。
WAWZONEK S., J. ORG. CHEM. <JOCE-AH>, 1976, 41, NO 19, 3149-3151