Synthesis and biological evaluation of deoxypreussomerin A and palmarumycin CP1 and related naphthoquinone spiroketals
摘要:
Oxidative cyclization of bis-hydroxynaphthyl ethers allows concise total syntheses of palmarumycin CP1 and deoxypreussomerin A in 8-9 steps and 15-35% overall yield from 5-hydroxy-8-methoxy-1-tetralone (8). Polymer-bound triphenyl phosphine was found to be a superior reagent for the rapid preparation of a small library of palmarumycin analogs. Preliminary biological evaluation of naphthoquinone spiroketals against MCF-7 and MDA-MB-231 human breast cancer cells revealed several low-micromolar growth inhibitors. (C) 2000 Elsevier Science Ltd. All rights reserved.
overall yield from O-methylnaphthazarin. Highlights of the synthetic work include an Ullmann coupling and a possibly biomimetic oxidative spirocyclization for the introduction of the naphthalene ketal as well as the use of a retro-Diels-Alder reaction to unmask the reactive enone moiety in the naphthoquinone bisepoxide ring system. A novel highly bulky chiral binaphthol ligand was developed for a boron-mediated
The peri interaction of 1-functionalized naphthalenes equipped with a triarylmethyl cation at the 8-position has been studied because of the reversibility of the ring-closing reaction, which was monitored closely by NMR spectroscopy in the case of the cyclic ammonium salt 5b. Carbocycle 4a and N-heterocycle 5b did not exhibit any tendency for ring cleavage under various conditions, whereas the naphtho-annulated
An Aluminum Ate Base: Its Design, Structure, Function, and Reaction Mechanism
作者:Hiroshi Naka、Masanobu Uchiyama、Yotaro Matsumoto、Andrew E. H. Wheatley、Mary McPartlin、James V. Morey、Yoshinori Kondo
DOI:10.1021/ja064601n
日期:2007.2.1
base and aromatic, followed by deprotonative formation of the functionalized aromatic aluminum compound. Deprotonation by the TMP ligand rather than the isobutyl ligand was suggested and reasoned by means of spectroscopic and theoretical study. The remarkable regioselectivity of the ortho alumination reaction was explained by a coordinative approximation effect between the functional groups and the counter
8-(Methyltosylaminoethynyl)-1-naphthyl (MTAEN) Glycosides: Potent Donors in Glycosides Synthesis
作者:Si-Yu Zhou、Xin-Ping Hu、Hui-Juan Liu、Qing-Ju Zhang、Jin-Xi Liao、Yuan-Hong Tu、Jian-Song Sun
DOI:10.1021/acs.orglett.1c04102
日期:2022.1.21
efficient glycosylation protocol has been established. The MTAEN glycosylation protocol exhibits the merits of shelf-stable donors, mild catalytic promotion conditions, considerably extended substrate scope encompassing both free alcohols, silylated alcohols, nucleobases, primary amides, and C-type nucleophile acceptors, and applicability to various one-pot strategies for highly efficient synthesis of oligosaccharides
Modular Design of Fluorescent Dibenzo- and Naphtho-Fluoranthenes: Structural Rearrangements and Electronic Properties
作者:Gavin S. Mohammad-Pour、Richard T. Ly、David C. Fairchild、Alex Burnstine-Townley、Demetrius A. Vazquez-Molina、Khang D. Trieu、Andres D. Campiglia、James K. Harper、Fernando J. Uribe-Romo
DOI:10.1021/acs.joc.8b00891
日期:2018.8.3
naphtho-fluoranthene polycyclic aromatic hydrocarbons (PAHs) with MW = 302 (C24H14) was synthesized via a Pd-catalyzed fluoranthene ring-closing reaction. By understanding the various modes by which the palladium migrates during the transformation, structural rearrangements were bypassed, obtaining pure PAHs in high yields. Spectroscopic and electrochemical characterization demonstrated the profound diversity
通过Pd催化的荧蒽闭环反应合成了MW = 302(C 24 H 14)的12种二苯并蒽和萘并荧蒽多环芳烃(PAHs)库。通过了解转变过程中钯迁移的各种模式,可以绕开结构重排,以高收率获得纯净的PAH。光谱和电化学表征证明了异构体之间电子结构的巨大差异。突出可见光发射方面的显着差异,该PAHs库将使它们的标准化能够用于毒理学评估和作为光电材料的潜在用途。