The key intermediates 5-benzyl-2-phenylpyrimidin-4(3H)-ones or (E)-5-benzylidene-2-phenyl- 5,6-dihydropyrimidin- 4(3H)-ones were obtained conveniently by cyclization of the acetates of Baylis – Hillman adducts and benzamidine hydrochloride in the presence of sodium ethoxide at room temperature. Chlorination of pyrimidinones with phosphorus oxychloride and subsequent treatment with morpholine and demethylation yielded PI3K inhibitors.
The reactivity of Morita-Baylis-Hillman allyl acetates was employed to introduce phosphorus-containing functionalities to the side chain of the cinnamic acid conjugated system by nucleophilic displacement. The proximity of two acidic groups, the carboxylate and phosphonate/phosphinate groups, was necessary to form interactions in the active site of urease by recently described inhibitor frameworks
for the synthesis of a valuable class of α‐aminomethylacrylates via the Baylis–Hillman reaction of different aldehydes with methyl acrylate followed by acetylation of the resulting allylic alcohols and SN2′‐type amination of the allylic acetates. Asymmetric hydrogenation of these diverse olefinic precursors using rhodium(Et‐Duphos) catalysts provided the corresponding β2‐amino acid derivatives with excellent
通过一种新的策略,通过不同醛类的Baylis-Hillman反应与丙烯酸甲酯的合成,然后合成的烯丙醇的乙酰化和乙酸烯丙酯的S N 2'型胺化反应,合成了有价值的α-氨基甲基丙烯酸酯类。使用铑这些不同的烯属前体的不对称氢化(ET-DUPHOS)催化剂提供了相应的β 2个具有优异的对映选择性的α-氨基酸衍生物和非常高的反应性(高达> 99.5%ee值和S / C = 10,000)。的(第一加氢Ž) -构型底物,研究了β的合成2氨基酸衍生物。对于该反应,还公开了底物几何形状和位阻对反应性和对映选择性的高影响。这个协议提供了用于光学纯β制备高度实用的,容易的和可扩展的方法2 -氨基酸和它们的衍生物在温和的反应条件下进行。
The Coupling of Tertiary Amines with Acrylate Derivatives via Visible-Light Photoredox Catalysis
作者:Xiaojun Dai、Dongping Cheng、Baochuan Guan、Wenjuan Mao、Xiaoliang Xu、Xiaonian Li
DOI:10.1021/jo501097b
日期:2014.8.1
Catalyzed by Ru(bpy)3(BF4)2, the photoredox coupling of tertiary amines with acrylate derivatives including Baylis–Hillman adducts under visible light irradiation was successfully established. The scope of the substrates was broad, and thus an array of γ-aminobutyric ester derivatives was obtained in moderate to good yields.