基于5-之间的三组分反应,开发了一种简单,无催化剂,简单且高效的药物学上令人感兴趣的全氟烷基化顺式-螺嘧啶-5,1'-喹啉和吡喃并[2,3- d ]嘧啶的合成方法。-10°C或65°C下的MeCN中的亚芳基巴比妥酸1,全氟烷基-2-酸甲酯2和吡啶3。该方案的显着特征是反应条件温和,不使用催化剂,反应时间短,操作简单且收率良好。
diastereoselective synthesis of perfluoroalkylated cis-spiropyrido[2,1-a]isoquinoline-1,5’-pyrimidine derivatives in good to excellent yields under mild conditions. The reaction mechanism was proposed to illustrate the formation of the diastereoisomers and proton-promoted transformation of trans-spiropyrido[2,1-a]isoquinoline-1,5’-pyrimidines to the more thermodynamically stable cis-isomers. The DFT calculation demonstrated
衍生自异喹啉和全氟烷基-2-炔酸甲酯的1,4-偶极易于与亚芳基取代的N,N-二甲基巴比妥酸反应,导致全氟烷基化的顺式-吡咯并[2,1- a ]异喹啉-1的第一个非对映选择性合成, 5'-嘧啶衍生物在温和条件下的产率高至优异。提出了反应机理以说明非对映异构体的形成和反式-吡咯并[ 2,1- a ]异喹啉-1,5'-嘧啶质子促进的转化为热力学更稳定的顺式异构体。DFT计算证明了反应的非对映选择性。
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed transfer 1,4-hydrostannylation of α,β-unsaturated carbonyls using iPr-tricarbastannatrane
The hypercoordinated tin reagent iPr-tricarbastannatrane is employed in B(C6F5)3-catalyzed transfer 1,4-hydrostannanylation of electron deficient olefins.
Bifunctional thiourea-catalyzed asymmetric [3 + 2] annulation reactions of 2-isothiocyanato-1-indanones with barbiturate-based olefins
作者:Jiang-Song Zhai、Da-Ming Du
DOI:10.3762/bjoc.18.3
日期:——
annulation reactions of 2-isothiocyanato-1-indanones with barbiturate-based olefins have been developed to afford chiral dispiro[indene-pyrrolidine-pyrimidine]s. Through this strategy, the target products could be obtained in good to excellent yields with excellent stereoselectivities. In addition, the synthetic utility was verified through a gram-scale synthesis, one-potthree-componentreactions and further
Chemoselective synthesis of 5,4′-imidazolinyl spirobarbiturates <i>via</i> NBS-promoted cyclization of unsaturated barbiturates and amidines
作者:Hui Xu、Rong-Lu Huang、Zhu Shu、Ran Hong、Ze Zhang
DOI:10.1039/d1ob00508a
日期:——
A selective cyclization of unsaturated barbiturates and amidines promoted by N-bromosuccinimide has been successfully developed to afford a vast variety of 5,4′-imidazolinyl spirobarbiturates in moderate to good yields. The present protocol features broad substrate scope, facile work-up procedure and mild reaction conditions, providing a novel strategy for the highly selective and efficient construction
Electrocatalytic cascade approach to the synthesis of dihydro-2'H,3H-spiro[1-benzofuran-2,5'-pyrimidines]
作者:Fedor V. Ryzhkov、Michail N. Elinson、Yuliya E. Ryzhkova、Anatoly N. Vereshchagin、Artem N. Fakhrutdinov、Mikhail P. Egorov
DOI:10.1007/s10593-021-02966-8
日期:2021.6
cyclohexane-1,3-diones in methanol in the presence of sodiumbromide as mediator in an undivided cell results in the formation of dihydro-2'H,3H-spiro[1-benzofuran-2,5'-pyrimidines] in 72–85% yields. This electrochemical process occurs under mild conditions, and the isolation procedure after the reaction is simple. The structures of the final compounds were confirmed by 1H–13C HMBC spectroscopy.
在溴化钠作为介质存在的情况下,亚苄基巴比妥酸盐和环己烷-1,3-二酮在甲醇中的电催化级联组装导致形成二氢-2' H ,3 H -螺[1-苯并呋喃-2,5 '-嘧啶]的产率为 72–85%。这种电化学过程发生在温和的条件下,反应后的分离过程简单。最终化合物的结构由1 H– 13 C HMBC 光谱证实。