Synthesis of Diversely Substituted Imidazolidines
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[3+2] Cycloaddition of 1,3,5‐Triazinanes with Donor‐Acceptor Aziridines and Their Anti‐Tumor Activity
cycloaddition of 1,3,5-triazinanes with donor-acceptor aziridines has been developed, accessing diverselysubstituted imidazolidines high efficiency. Mechanistic investigations support the formation of imidazolidines through an SN1-like pathway. Furthermore, these imidazolidines exhibit promising anti-tumor activity against a series of human cancer cell lines.
已经开发了AY(OTf)3催化的供体-受体氮丙啶与1,3,5-三嗪并[3 + 2]环加成反应,可高效获得各种取代的咪唑烷。机理研究支持通过S N 1样途径形成咪唑烷。此外,这些咪唑烷类化合物显示出对一系列人类癌细胞系的有希望的抗肿瘤活性。
Catalytic Asymmetric Hydroacyloxylation/Ring-Opening Reaction of Ynamides, Acids, and Aziridines
A highlyenantioselective three-component reaction of ynamides with carboxylic acids and 2,2′-diester aziridines has been realized by using a chiralN,N′-dioxide/Ho(OTf)3 complex as a Lewis acid catalyst. The process includes the formation of an α-acyloxyenamide intermediate through the addition of carboxylic acids to ynamides and the following enantioselective nucleophilic addition to in-situ-generated
The enantioselective [3 + 1]-cycloaddition of racemic donor–acceptor (D–A) aziridines with isocyanides was first realized under mild reaction conditions using a chiral N,N′-dioxide/MgII complex as catalyst, providing a facile route to enantioenriched exo-imido azetidines with good to excellent yield (up to 99%) and enantioselectivity (up to 94% ee). An obvious chiral amplification effect was observed
An enantioselective [3+2] annulation of donor-acceptor aziridines with aldehydes has been realized using Nd(OTf)3/N,N[prime or minute]-dioxide/LiNTf2 catalyst system, providing various chiral cis-1,3-oxazolidines in moderate to good yields with high level of stereocontrol....
A highly diastereo- and enantioselective [3 + 2] cycloaddition of 2,2′-diester aziridines with 3,4-dihydropyran derivatives and acyclic enolethers has been established. Various optically active octahydropyrano[2,3-c]pyrrole and 3-methoxypyrrolidine derivatives were generated in moderate to high yields (up to 94%) and good stereoselectivities (>19:1 dr, up to 95.5:4.5 er). The methodology was also
已经建立了2,2'-二酯氮丙啶与3,4-二氢吡喃衍生物和非环烯醇醚的高度非对映和对映选择性[3 + 2]环加成反应。以中等至高产率(高达94%)和良好的立体选择性(> 19:1 dr,高达95.5:4.5 er)生成了各种旋光的八氢吡喃并[2,3- c ]吡咯和3-甲氧基吡咯烷衍生物。该方法还用于d-半乳糖衍生物的高度非对映选择性合成中。八氢吡喃并[2,3- c ]吡咯的绝对构型表明,在最后的环化步骤中,使用3,4-二氢吡喃和6-烷基取代的吡咯为底物的反应给出了反向的非对映异构。