Novel Macrocyclic Amidinoureas: Potent Non-Azole Antifungals Active against Wild-Type and Resistant Candida Species
摘要:
Novel macrocyclic amidinourea derivatives 11, 18, and 25 were synthesized and evaluated as antifungal agents against wild-type and fluconazole resistant Candida species. Macrocyclic compounds 11 and 18 were synthesized through a convergent approach using as a key step a ring-closing metathesis macrocyclization reaction, whereas compounds 25 were obtained by our previously reported synthetic pathway. All the macrocyclic amidinoureas showed antifungal activity toward different Candida species higher or comparable to fluconazole and resulted highly active against fluconazole resistant Candida strains showing in many cases minimum inhibitory concentration values lower than voriconazole.
catalyst give access to indoles, 1,4-dihydroquinolines, and 1,2-dihydroisoquinolines, respectively. This sequential protocol also allows the synthesis of dihydrobenzoazepines, although the ring-closingmetathesis (RCM) step is complicated by the alkene isomerization processes. From certain substrates, the direct annulation is observed in the titanium-mediated step, which is likely to occur through an
Enantioselective CH Bond Functionalization Triggered by Radical Trifluoromethylation of Unactivated Alkene
作者:Peng Yu、Jin-Shun Lin、Lei Li、Sheng-Cai Zheng、Ya-Ping Xiong、Li-Jiao Zhao、Bin Tan、Xin-Yuan Liu
DOI:10.1002/anie.201405401
日期:2014.10.27
An asymmetric unactivatedalkene/CHbond difunctionalization reaction for the concomitant construction of CCF3 and CO bonds was realized by using a Cu/Brønsted acid cooperative catalytic system, thus providing facile access to valuable chiral CF3‐containing N,O‐aminals with excellent regio‐, chemo‐, and enantioselectivity. Mechanistic studies revealed that this reaction may proceed by an unprecedented
不对称非活化烯烃/ C 为C的伴随建筑H键difunctionalization反应 CF 3和C O键是通过使用Cu /布朗斯台德酸催化的合作系统,从而提供了有价值的手性CF容易访问实现3含Ñ ,O-缩醛胺具有出色的区域,化学和对映选择性。机制研究表明,该反应可以通过涉及未活化烯烃的活化和自由基三氟甲基化以引发的C后续的对映选择性的官能化了前所未有的1,5-氢化移继续H键。对照实验还表明,手性布朗斯台德酸起多种作用,不仅控制立体选择性,而且还通过激活Togni试剂提高了反应速率。
Copper‐Catalyzed Cope‐Type Hydroamination of Nonactivated Olefins toward Cyclic Nitrones: Scope, Mechanism, and Enantioselective Process Development
remains underdeveloped. Herein we report the copper-catalyzed Cope-type hydroamination of oximes with pendant nonactivated olefins, which enables facile access to a series of five- and six-membered cyclic nitrones under mild conditions. In this study, heterocycle-tethered oximes were employed in the Cope-type hydroaminationreaction for the first time. High enantioselectivity was achieved for carbon-tethered
Novel macrocyclic amidinourea derivatives 11, 18, and 25 were synthesized and evaluated as antifungal agents against wild-type and fluconazole resistant Candida species. Macrocyclic compounds 11 and 18 were synthesized through a convergent approach using as a key step a ring-closing metathesis macrocyclization reaction, whereas compounds 25 were obtained by our previously reported synthetic pathway. All the macrocyclic amidinoureas showed antifungal activity toward different Candida species higher or comparable to fluconazole and resulted highly active against fluconazole resistant Candida strains showing in many cases minimum inhibitory concentration values lower than voriconazole.