A versatile approach to pyrimidin-4-yl substituted α-amino acids from alkynyl ketones; the total synthesis of l-lathyrine
作者:Robert M. Adlington、Jack E. Baldwin、David Catterick、Gareth J. Pritchard
DOI:10.1039/a704526c
日期:——
A range of pyrimidin-4-yl substituted α-amino acids has been
synthesised by the reaction of amidines with α-amino acid alkynyl
ketones.
一系列吡啶-4-基取代的α-氨基酸通过脒与α-氨基酸炔酮的反应合成得到。
A Noncatalytic Approach to Hetaryl-Annulated 1,2,4-Thiadiazine-1,1-dioxides
作者:Artem Cherepakha、Vladimir O. Kovtunenko、Andrey Tolmachev、Oleg Lukin
DOI:10.1002/jhet.1029
日期:2013.8
out through a reaction of hetaryl‐sulfonyl chlorides with amidines under mild noncatalytic conditions. In the case of 2‐chloropyridine‐3‐sulfonyl chloride derivatives and 2,4‐dichlorothiazole‐5‐sulfonyl chloride open‐chain sulfonylated amidine intermediates were isolated and then subjected to the cyclization step. The reaction with 2,4‐dichloropyrimidine‐5‐sulfonyl chloride gave rise to the corresponding
Synthesis of 2-Substituted Pyrimido[5,4-b]indolizine Derivatives from Acetates of Baylis-Hillman Adducts
作者:Chunhao Yang、Yuyuan Xie、Min Jiang、Qian He
DOI:10.3987/com-08-11428
日期:——
synthesized conveniently in two steps. The key intermediates 2-substituted 5-[(pyridin-2-yl)methyl]pyrimidin-4(3H)-ones 2 were obtained by facile cyclization of the acetate of Baylis-Hillman adduct 3 and various amidine hydrochlorides 4 in the presence of sodium ethoxide. Treatment of 5-[(pyridin-2-yl)methyl]pyrimidin-4(3H)-ones 2 with phosphoryl chloride by reflux afforded fused 2-substituted pyrimido[5
Solid phase synthesis of dihydropyrimidinones and pyrimidinone carboxylic acids from malonic acid resin
作者:Bruce C. Hamper、Kevin Z. Gan、Thomas J. Owen
DOI:10.1016/s0040-4039(99)00961-2
日期:1999.7
Malonicacidresin 1 and the corresponding diester 2 have been used for the preparation of dihydropyrimidinones 6 and pyrimidinone carboxylic acids 8. Knoevenagel condensation of the unsymmetrical resin bound malonate diester 2 followed by condensation with amidines provides dihydropyrimidinone carboxylate esters 4. Cleavage of 4 with TFA afforded the carboxylic acid 5 which undergoes decarboxylation
Convenient Synthesis of Fluorescent Chromeno[4,3-d]pyrimidines from Electron-Deficient 3-Vinylchromones
作者:Nikita M. Chernov、Roman V. Shutov、Anastasia E. Potapova、Igor P. Yakovlev
DOI:10.1055/s-0039-1690723
日期:2020.1
We report an easy and powerful approach to the synthesis of novel chromeno[4,3-d]pyrimidine-5-acetic acids through ANRORC reaction of electron-deficient 3-vinylchromones and 1,3-N,N-binucleophiles. The reaction proceeds under mild conditions (EtOH, rt) and is applicable to a wide range of substrates. The described compounds show fluorescence in the violet-blue range (390–460 nm) with Stokes shift of
我们报告了一种简单而强大的方法,通过缺电子的3-乙烯基色酮和1,3- N,N-双亲核试剂的ANRORC反应合成新型铬诺[4,3 - d ]嘧啶-5-乙酸。反应在温和的条件下(EtOH,rt)进行,适用于多种底物。所描述的化合物在紫蓝色范围(390–460 nm)中显示荧光,斯托克斯位移为40–80 nm,量子产率适中(0.15–0.20)。由于吸电子基团以乙酸片段的形式保守,因此这些化合物可以容易地被官能化或缀合至所需的底物以用于(生物)分析目的。