Direct synthesis of 5- and 6-substituted 2-aminopyrimidines as potential non-natural nucleobase analogues
作者:K. Radhakrishnan、Namita Sharma、Lal Mohan Kundu
DOI:10.1039/c4ra00249k
日期:——
A series of 2-aminopyrimidine derivatives, substituted at 5- and 6-positions, were synthesized. The reaction was carried out in a single step by treatment of the corresponding β-ketoester or β-aldehydoester with guanidine hydrochloride in the presence of K2CO3, in a microwave-assisted method without the requirement of solvent. A unique 1 : 1 co-crystal structure was obtained which shows that a 6-p
合成了一系列5-和6-位取代的2-氨基嘧啶衍生物。该反应通过在K 2 CO 3存在下用盐酸胍处理相应的β-酮酸酯或β-醛二酸酯来一步进行。,不需要溶剂的微波辅助方法。获得独特的1:1共晶体结构,其显示6-苯基-2-氨基嘧啶酮与胞嘧啶形成强的核碱基对,涉及三个氢键。发现该碱基对与天然鸟嘌呤:胞嘧啶(G:C)一样强,表明合成衍生物的潜在应用。此外,我们还报告了第二个共晶体,该晶体以5:1的比例包含5-异丙基-6-甲基-2-氨基嘧啶酮和胞嘧啶,这也显示出很强的碱基配对特性。
Direct Chemoselective Synthesis of N-3-Substituted Pyrimidinones in a Microwave-Assisted Method
作者:Burgula Laxminarayana、Lal Mohan Kundu
DOI:10.1080/00397911.2015.1017770
日期:2015.6.3
chemoselective alkylation, benzylation, and arylation of C-5 and C-6 substituted pyrimidine nucleobases selectively at the N-3 position. The reactions were found to proceed, with high efficiency, without the requirement of solvent and were complete within 10–15 min of irradiation. The efficiency of the method was further improved by addition of a Lewis acid, which not only increases the yield significantly but
Catalytic asymmetric construction of C-4 alkenyl substituted pyrazolone derivatives bearing multiple stereoelements
作者:Wande Zhang、Shiqiang Wei、Wenyao Wang、Jingping Qu、Baomin Wang
DOI:10.1039/d1cc01123e
日期:——
An organocatalyticasymmetric process was reported for the sterically precise construction of C-4 alkenyl substituted pyrazolone derivatives bearing multiple stereoelements. A series of interesting products featuring the union of a centrally chiral pyrazolone moiety and an axially chiral styrene unit were obtained in high yield with excellent diastereoselectivity and enantioselectivity (up to 99% ee