Arylene Imine Macrocycles of C3h and C3 Symmetry from Reductive Imination of Nitroformylarenes
摘要:
Novel C-3-symmetric phenylene imine macrocycles have been synthesized by reductive imination of single nitroformylarenes. Pore size and geometric shape are dictated by the distance between and orientation of the nitro and aldehyde moieties in the precursor backbone. This reaction is facile, requires no purification of the products, and is environmentally friendly.
Thermal C<sup>2</sup>−C<sup>6</sup> Cyclization of Enyne−Allenes. Experimental Evidence for a Stepwise Mechanism and for an Unusual Thermal Silyl Shift
作者:Michael Schmittel、Atul A. Mahajan、Götz Bucher、Jan W. Bats
DOI:10.1021/jo062448+
日期:2007.3.1
cyclization. The ratio of ene versus formal Diels−Alder products could be rationalized on the basis of steric effects. Only the thermolysis of 4c, equipped with the fast diphenylcyclopropylcarbinyl radical clock, afforded a 1,3-butadienyl benzofulvene clearly formed via cyclopropyl ring opening. This finding provides unambiguous evidence for a stepwise mechanism of the C2−C6 cyclization making it possible
Synthesis of Isoquinolines and Pyridines by the Palladium/Copper-Catalyzed Coupling and Cyclization of Terminal Acetylenes and Unsaturated Imines: The Total Synthesis of Decumbenine B
作者:Kevin R. Roesch、Richard C. Larock
DOI:10.1021/jo010579z
日期:2002.1.1
have been developed. However, aryl-, vinylic-, and alkyl-substituted acetylenes undergo palladium-catalyzed coupling and subsequent copper-catalyzed cyclization in excellent yields. The totalsynthesis of the isoquinoline natural product decumbenine B has been accomplished in seven steps and 20% overall yield by employing this palladium-catalyzed coupling and cyclization methodology.
作者:Bifu Liu、Wensen Ouyang、Jianhong Nie、Yang Gao、Kejun Feng、Yanping Huo、Qian Chen、Xianwei Li
DOI:10.1039/d0cc04739b
日期:——
coordinated amine derivative enabled regioselective C–H functionalization remains challenging due to the elusive achievement of reactivity and selectivity simultaneously. Herein, regioselective C–Halkynylation of various readily transformable nitrogen functionalities was developed with great efficiency, with the assistance of the mono-N-protected amino acid (MPAA) ligand via Pd(II) catalysis proceeding via
Photochemical C<sup>2</sup>−C<sup>6</sup> Cyclization of Enyne−Allenes: Detection of a Fulvene Triplet Diradical in the Laser Flash Photolysis
作者:Götz Bucher、Atul A. Mahajan、Michael Schmittel
DOI:10.1021/jo801689w
日期:2008.11.21
products. In contrast, the photochemical C(2)-C(6) cyclization of enyne-allenes provided formal Diels-Alder and/or ene products, with higher yields for the benzannulated systems. A raise of the temperature in the photochemical cyclization of enyne-allene 1b' led to increasing amounts of the ene product in relation to that of the formal Diels-Alder product. Laserflashphotolysis at 266 and 355 nm as well
<i>N</i>-Iodosuccinimide-Promoted Rapid Access to Indeno[1,2-<i>c</i>]pyrroles<i>via</i>[3+2] Annulation of Enamine-alkynes
作者:Jampani Santhi、Beeraiah Baire
DOI:10.1002/adsc.201600711
日期:2016.12.7
(NIS)‐promoted, cascade strategy for the efficient synthesis of biologically important indeno[1,2‐c]pyrroles via a [3+2] annulation process of enamine‐alkynes. This methodology had shown a very broad scope for diversely functionalized enamines and alkynes. We have also developed a one‐pot, multicomponent strategy for the direct synthesis of indeno‐pyrrolesfrom diynones via enamine‐alkynes. Control experiments
我们已经开发了一种无金属,N-碘代琥珀酰亚胺(NIS)促进的级联策略,用于通过烯胺炔烃的[3 + 2]环合法有效合成重要的生物学上重要的茚并[1,2- c ]吡咯。该方法学显示了功能多样的烯胺和炔烃的广泛应用范围。我们还开发了一种单锅多组分策略,可通过烯胺炔烃直接从二酮中合成茚并吡咯。对照实验支持NIS通过离子机制而非自由基途径作为亲电子活化剂的参与。