通过衍生自钒配合物VO(acac)2和C 2对称双-异羟肟酸(BHA)配体的配合物,实现了吲哚衍生物的对映选择性脱芳香化。反应通过不对称环氧化和通过连接的苯酚级联反应进行的开环反应,在不低于83%收率和98%ee的条件下,获得了5a,6,10b,11-四氢色素[2,3 - b ]吲哚-10b-ol衍生物。反应条件温和。
Design, step-economical diversity-oriented synthesis of an N-heterocyclic library containing a pyrimidine moiety: discovery of novel potential herbicidal agents
The synthesis of highly diverse libraries has become of paramount importance for obtaining novel leads for drug and agrochemical discovery. Herein, the step-economical diversity-oriented synthesis of a library of various pyrimidine-N-heterocycle hybrids was developed, in which a 4,6-dimethoxypyrimidine core was incorporated into nine kinds of N-heterocycles. A total of 34 structurally diverse compounds
高度多样化的文库的合成对于获得药物和农用化学品发现的新先导化合物变得至关重要。在此,开发了各种嘧啶-N-杂环杂化物文库的步骤经济的多样性导向合成方法,其中将4,6-二甲氧基嘧啶核心掺入九种N-杂环中。总共 34 种结构不同的化合物是通过两步法从非常简单且市售的起始材料合成的。此外,该文库的体内生物筛选鉴定出 11 种活性化合物,这些化合物在每公顷 750 g ai 剂量下对 D. sanguinalis 表现出良好的芽后除草活性。更重要的是,嘧啶-四氢咔唑杂化物5q在相同剂量下对五种测试杂草表现出良好至优异的除草活性。嘧啶-四氢咔唑杂化物代表了一类新型除草剂,可能成为除草剂发现过程中有前途的先导化合物。
Iron-Catalyzed Direct C3-Benzylation of Indoles with Benzyl Alcohols through Borrowing Hydrogen
作者:Giovanni Di Gregorio、Michele Mari、Francesca Bartoccini、Giovanni Piersanti
DOI:10.1021/acs.joc.7b01603
日期:2017.8.18
We present the coupling of primary and secondary benzylalcohols with indoles to form 3-benzylated indoles and H2O that is catalyzed, for the first time, by a complex of earth-abundant iron. This transformation accommodates a variety of substrates and is distinguished by its operational simplicity, sustainability, high functional-group tolerance, and amenability to gram-scale synthesis. On the basis
A catalytic <i>N</i>-deacylative alkylation approach to hexahydropyrrolo[2,3-<i>b</i>]indole alkaloids
作者:Nivesh Kumar、Arindam Maity、Vipin R. Gavit、Alakesh Bisai
DOI:10.1039/c8cc04117b
日期:——
strategy to diversely functionalized hexahydropyrrolo[2,3-b]indole alkaloids is described in high chemical yields. The synthesis features a key Pd(0)-catalyzed deacylative alkylation of N-acyl 3-substituted indoles using only 1 mol% of Pd(PPh3)4. The scope of this methodology is further defined in the asymmetric synthesis of pyrroloindolines using a diastereoselective approach.
以高化学产率描述了多样化功能化的六氢吡咯并[2,3- b ]吲哚生物碱的一种通用的前所未有的策略。合成的特征是仅使用1 mol%的Pd(PPh 3)4的N-酰基3取代的吲哚的关键Pd(0)催化的脱酰基烷基化反应。该方法的范围在使用非对映选择性方法不对称合成吡咯并二氢吲哚中进一步定义。
Dearomatization of Indoles<i>via</i>a Phenol-Directed Vanadium- Catalyzed Asymmetric Epoxidation and Ring-Opening Cascade
作者:Long Han、Wei Zhang、Xiao-Xin Shi、Shu-Li You
DOI:10.1002/adsc.201500557
日期:2015.10.12
An enantioselective dearomatization of indole derivatives was realized by the complexes derived from the vanadium complex VO(acac)2 and C2-symmetric bis-hydroxamic acid (BHA) ligands. The reaction proceeded via asymmetricepoxidation and ring-opening by the linked phenol cascade, affording 5a,6,10b,11-tetrahydrochromeno[2,3-b]indol-10b-ol derivatives in up to 83% yield and 98% ee under mild reaction
通过衍生自钒配合物VO(acac)2和C 2对称双-异羟肟酸(BHA)配体的配合物,实现了吲哚衍生物的对映选择性脱芳香化。反应通过不对称环氧化和通过连接的苯酚级联反应进行的开环反应,在不低于83%收率和98%ee的条件下,获得了5a,6,10b,11-四氢色素[2,3 - b ]吲哚-10b-ol衍生物。反应条件温和。
Copper‐Catalyzed Chemoselective Divergent Carbene Insertion into the N−H bonds of Tryptamines
作者:Dharmendra Kumar、Malleswara Rao Kuram
DOI:10.1002/adsc.202300893
日期:2023.11.21
synthesis. Herein, we have developed a chemoselective copper-catalyzed carbene insertion protocol onto N−H bonds of tryptamine derivatives. Divergent insertion products are obtained by varying the nucleophilicity of the aliphatic NH of tryptamine with electron-donating or electron-withdrawing groups. The reaction provided N−H insertion products with broad substrate scope in good yields.