Synthesis of 5-Substituted Aminopyrrolo[3,4-b]quinolinones by a Diorganozinc-Mediated Tandem Alkylation/Cyclization
作者:James B. Campbell、Judy W. Firor
DOI:10.1080/00397911.2010.542537
日期:2012.6
with N-(oxopyrrolin-4-yl)-3-chloromethylbenzonitriles provides 5-substituted aminopyrrolo[3,4-b]quinolines by an overall single-pot, tandem alkylation/cyclization sequence. Mechanistic considerations suggest an in situ–generated ortho-quinonemethideimine (aza-ortho-xylylene) as a reactive intermediate, which may trap an alkyl group from the diorganozinc reagent by a conjugate addition. GRAPHICAL
Total Synthesis of (−)-Xylogranatopyridine B via a Palladium-Catalyzed Oxidative Stannylation of Enones
作者:Alexander W. Schuppe、David Huang、Yifeng Chen、Timothy R. Newhouse
DOI:10.1021/jacs.7b13189
日期:2018.2.14
We report a total synthesis of the pyridine-containing limonoid alkaloid (-)-xylogranatopyridine B in 11 steps from commercially available dihydrocarvone. The central pyridine ring was assembled by a late-stage fragment coupling approach employing a modified Liebeskind pyridine synthesis. One fragment was prepared by an allyl-palladium catalyzed oxidativeenone β-stannylation, in which the key bimetallic
我们报告了含吡啶的柠檬苦素生物碱 (-)-xylogranatopyridine B 在 11 个步骤中从市售二氢香芹酮的全合成。中央吡啶环通过后期片段偶联方法组装,采用改良的 Liebeskind 吡啶合成。一个片段是通过烯丙基-钯催化的氧化烯酮β-甲锡烷基化制备的,其中关键的双金属β-甲锡烷基钯烯醇化物中间体经历了β-氢化物消除。这种方法还允许在烯酮的 β 位引入烷基和甲硅烷基。
Divergent Nickel-Catalysed Ring-Opening–Functionalisation of Cyclobutanone Oximes with Organozincs
alkylation, arylation, vinylation and alkynylation of nitriles is presented. The methodology uses electron-poor O-Ar cyclic oximes and organozincs as coupling partners. This redox process proceeds through the generation of an iminyl radical and its following ring-openingreaction.
Regioselective C–H bond functionalizations of acridines using organozinc reagents
作者:Isao Hyodo、Mamoru Tobisu、Naoto Chatani
DOI:10.1039/c1cc16582h
日期:——
Despite the recent advance in CâH bond functionalization chemistry, the CâH bonds in the acridine ring system, which is an important scaffold in medicinal and material science, have met with limited success, due, in part, to the lack of activated CâH bonds adjacent to the ring nitrogen atom. Herein, several protocols that can effect the regioselective arylation and alkylation of acridines at the C-4 and C-9 positions are described.
1,6-Conjugate addition of zinc alkyls to para-quinone methides in a continuous-flow microreactor
作者:Abhijeet S. Jadhav、Ramasamy Vijaya Anand
DOI:10.1039/c6ob02277d
日期:——
An efficient protocol has been developed for the 1,6-conjugate addition of zinc alkyls to p-quinone methides under continuous-flow using a microreactor.