Pd(II)-Catalyzed Intramolecular Amidoarylation of Alkenes with Molecular Oxygen as Sole Oxidant
摘要:
Stereoselective palladium-catalyzed synthesis of structurally versatile indoline derivatives, using molecular oxygen as the sole oxidant, is described. New C-N and C-C bonds form across an alkene in an intramolecular manner. The C-N bond-forming step proceeds via a syn-amidopalladation pathway. The moderate kinetic isotope effects (intramolecular KIE = 3.56) suggest that electrophilic aromatic substitution occurs in the arylation step.
Heterocyclic group transfer reactions with I(<scp>iii</scp>) <i>N</i>-HVI reagents: access to <i>N</i>-alkyl(heteroaryl)onium salts <i>via</i> olefin aminolactonization
作者:Anthony F. Tierno、Jennifer C. Walters、Andres Vazquez-Lopez、Xiao Xiao、Sarah E. Wengryniuk
DOI:10.1039/d1sc00187f
日期:——
Pyridinium and related N-alkyl(heteroaryl)onium salts are versatile synthetic intermediates in organic chemistry, with applications ranging from ring functionalizations to provide diverse piperidine scaffolds to their recent emergence as radical precursors in deaminative cross couplings. Despite their ever-expanding applications, methods for their synthesis have seen little innovation, continuing to
吡啶鎓和相关的N-烷基(杂芳基)鎓盐是有机化学中的多功能合成中间体,其应用范围从环官能化以提供多种哌啶支架到最近作为脱氨基交叉偶联中的自由基前体出现。尽管它们的应用不断扩大,但其合成方法几乎没有创新,仍然依赖于有限的数十年历史的转化和有限的偶联伙伴子集。在此,我们利用(双)阳离子氮连接的 I( III ) 高价碘试剂或N -HVI 作为“杂环基团转移试剂”,通过氨基内酯化提供广泛的N -烷基(杂芳基)鎓盐链烯酸的合成,这是与烯烃直接生成这些盐的第一个例子。该反应在温和的条件下以优异的产率进行,并且能够掺入广泛的空间和电子多样化的芳香杂环。 N -HVI 试剂可以原位生成,通过简单的研磨分离产物,随后的衍生化证明了该平台用于以多样性为导向的六元氮杂环合成的能力。
<scp>Palladium‐Catalyzed</scp>
Tandem Carbonylative
<scp>Aza‐Wacker‐Type</scp>
Cyclization of Nucleophile Tethered Alkene to Access Fused
<scp>
<i>N</i>
‐Heterocycles
</scp>
作者:Lijun Shi、Mingshan Wen、Fuwei Li
DOI:10.1002/cjoc.202000491
日期:2021.2
tandem reactions offer rapid access to structurally complex molecules in one‐pot reaction, the selectivity issue needs to be addressed particularly when incompatible step reactions are involved. Herein, we report the selective synthesis of fused N‐heterocycles from nucleophile‐tethered alkenylamide and carbon monoxide via palladium (Pd)‐catalyzed tandem carbonylative aza‐Wacker‐type cyclization. The
Chiral triaryl phosphates promote the enantioselectiveiodolactonization of 4‐substituted 4‐pentenoic acids to give the corresponding iodolactones in high yields with high enantioselectivity. N‐Chlorophthalimide (NCP) is employed as a Lewis acidicactivator and oxidant of I2 for the present iodolactonization. In combination with 1.5 equivalents of NCP, only 0.5 equivalents of I2 are sufficient to generate
The present invention relates to relates to macrocyclic small molecule inhibitors of the Sonic Hedgehog signaling pathway, syntheses thereof, and intermediates thereto. Such small molecule modulators of the Sonic Hedgehog signaling pathway are useful in the treatment of proliferative diseases (e.g., basal cell carcinoma, Gorlin syndrome, medulloblastoma, or pancreatic cancer), pulmonary diseases (e.g., interstitial pnuemonitis or interstitial pulmonary fibrosis), and developmental disorders (e.g., phocomelia or cyclopia). Novel non-natural macrocycles are provided that inhibit Sonic Hedgehog induced-protein transcription.
作者:Rajat Maji、Santanu Ghosh、Oleg Grossmann、Pinglu Zhang、Markus Leutzsch、Nobuya Tsuji、Benjamin List
DOI:10.1021/jacs.3c01404
日期:2023.4.26
Despite recent advancements in the development of catalyticasymmetric electrophile induced lactonization reactions of olefinic carboxylic acids, the archetypical hydrolactonization has long remained an unsolved and well-recognized challenge. Here, we report the realization of a catalyticasymmetric hydrolactonization using a confined imidodiphosphorimidate (IDPi) Brønsted acid catalyst. The method
尽管最近在催化不对称亲电试剂诱导的烯烃羧酸内酯化反应的发展方面取得了进展,但原型加氢内酯化长期以来一直是一个未解决且公认的挑战。在这里,我们报告了使用限制性亚氨基二磷酸酯 (IDPi) 布朗斯台德酸催化剂实现催化不对称加氢内酯化。该方法操作简单、可扩展且与多种底物兼容。它的潜力通过倍半萜烯 (−)-boivinianin A 和 (+)-gossonorol 的简明合成得到展示。通过深入的物理化学和 DFT 分析,我们得出了该反应的机理和对映选择性的细微差别。