A facile aminocyclization for the synthesis of pyrrolidine and piperidine derivativesElectronic supplementary information (ESI) available: experimental details and characterization data. See http://www.rsc.org/suppdata/cc/b3/b304157c/
A facile aminocyclization for the synthesis of pyrrolidine and piperidine derivativesElectronic supplementary information (ESI) available: experimental details and characterization data. See http://www.rsc.org/suppdata/cc/b3/b304157c/
Reversal of polarity by catalytic SET oxidation: synthesis of azabicyclo[<i>m</i>.<i>n</i>.0]alkanes <i>via</i> chemoselective reduction of amidines
作者:Kirana Devarahosahalli Veeranna、Kanak Kanti Das、Sundarababu Baskaran
DOI:10.1039/d1ob00416f
日期:——
A one-pot catalytic method has been developed for the stereoselective synthesis of cyclopropane-fused cyclic amidines using CuBr2/K2S2O8 as an efficient single electron transfer (SET) oxidative system. The generality of this mild method is demonstrated with a wide variety of substrates to furnish pharmaceutically important amidines containing aza-bicyclic and novel aza-tricyclic frameworks in very
使用CuBr 2 /K 2 S 2 O 8作为有效的单电子转移(SET)氧化体系,开发了一种用于立体选择性合成环丙烷稠合环脒的单锅催化方法。这种温和方法的普遍性通过多种底物得到证明,以非常好的收率提供含有氮杂-双环和新型氮杂-三环骨架的药学上重要的脒。将环脒化学选择性还原为 2-/3-氮杂双环[ m . n .0]烷烃和八氢吲哚已使用 NaBH 4 /I 2开发试剂系统。化学选择性还原脒官能团的合成范围已在基于亚氨基糖的 (±)-表喹酰胺类似物的立体选择性合成中得到例证。
Bis(amidate)bis(amido) Titanium Complex: A Regioselective Intermolecular Alkyne Hydroamination Catalyst
作者:Jacky C.-H. Yim、Jason A. Bexrud、Rashidat O. Ayinla、David C. Leitch、Laurel L. Schafer
DOI:10.1021/jo402668q
日期:2014.3.7
o) titanium precatalyst for the anti-Markovnikov hydroamination of alkynes is reported. Hydroamination of terminal and internal alkynes with primary alkylamines, arylamines, and hydrazines is promoted by 5–10 mol % of Ti catalyst. Various functional groups are tolerated including esters, protected alcohols, and imines. The in situ generated complex shows comparable catalytic activity, demonstrating
The disparate reaction pattern allowed the separate activation of non-ylidic S-alkyl and S-aryl bond. Under acidic conditions, sulfonium ylides serve as alkyl cation precursors which facilitate the alkylations. While under alkaline conditions, cleavage of non-ylidic S-aryl bond produces O-arylated compounds efficiently. The robustness of the protocols were established by the excellent compatibility of
Disclosed herein are secondary amine compounds that inhibit tRNA synthetase. The compounds of the invention are useful in inhibiting tRNA synthetase in Gram-negative bacteria and are useful in killing Gram-negative bacteria. The secondary amine compounds of the invention are also useful in the treatment of tuberculosis.
Studies concerning the electrophilic amino-alkene cyclisation for the synthesis of bicyclic amines
作者:Johannes E. M. N. Klein、Helge Müller-Bunz、Paul Evans
DOI:10.1039/b819610a
日期:——
octahydroquinoline 2i. The presence of an N-substituent bearing a stereogenic centre (1h and 1i) was studied and the products 2h and 2i were isolated with no diastereoselectivity. When NBS was used a novel cyclisation, forming bromo-substituted octahydroindoles 9a,b and d, was observed. In relation to this sequence it was shown that these products were not intermediates in the former Br2/PHT processes and that
已使用Br 2,PHT和NBS研究了一系列环己烯基取代的仲胺1a-i的溴化。在Br 2和NBS的情况下,仲胺优先进行N-溴化。相反,PHT干净地提供了烯烃二溴化产物。在溴的情况下,2的Ñ溴物种然后给烯烃二溴化的产物,尽管效率较低。随后用K 2 CO 3处理时,这些二溴化物形成相应的六氢吲哚2a-h和八氢喹啉 2i。研究了带有立体定位中心的N-取代基(1h和1i)的存在,并且分离了产物2h和2i,没有非对映选择性。当使用NBS进行新型环化时,观察到形成溴取代的八氢吲哚9a,b和d。关于该序列,表明这些产物不是先前的Br 2 / PHT过程中的中间体,并且该反应仅在N-溴化的琥珀酰亚胺副产物的存在下进行。