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
作者:WAWZONEK S.
DOI:——
日期:——
One or Two-Step Bohlmann-Rahtz Heteroannulation of 6-Aminouracil Derivatives for the Synthesis of Pyrido[2,3-<i>d</i>]pyrimidines
作者:Mark C. Bagley、David D. Hughes
DOI:10.1055/s-2002-32953
日期:——
The Michael addition-cyclodehydration of a 6-aminouracil and alkynone proceeds to give 5-deazapterin derivatives with total control of regiochemistry. This simple and facile cyclocondensation process is catalyzed by zinc(II) bromide or ytterbium(III) trifluoromethanesulfonate at 110 °C, providing the heteroannulated products in up to 94% yield.
6-氨基尿嘧啶和炔酮的迈克尔加成环脱水反应得到完全控制区域化学的5-去氮杂蝶呤衍生物。这种简单易行的环缩合反应由溴化锌 (II) 或三氟甲磺酸镱 (III) 在 110 °C 催化,以高达 94% 的产率提供杂环化产物。