3-Aminoquinazoline–phosphine ligands and their ruthenium(II) complexes: application in catalytic hydrogenation and transfer hydrogenation reactions
作者:Mustafa Kemal Yılmaz、Mustafa Keleş
DOI:10.1007/s11243-018-0213-9
日期:2018.4
and microanalysis. The 3-aminoquinazolinone–phosphine ligands were found to coordinate with the Ru(II) center via their phosphorus and nitrogen atoms. The Ru(II) complexes were applied as catalysts for the hydrogenation and transferhydrogenation of prochiral ketones. The results showed that these complexes are efficient transferhydrogenation catalysts.
Stereoisomerism in 3-[N-(2-acetoxypropanoyl)-N-acylamino]quinazolin-4(3H )-ones, enantioselective acylating agents
作者:Abdullah G. Al-Sehemi、Robert S. Atkinson、John Fawcett、David R. Russell
DOI:10.1039/b005814i
日期:——
The title compounds diacylaminoquinazolinones (DAQs) are enantioselective acylation agents for amines and a detailed study of their stereostructures was undertaken with the aim of understanding how this enantioselectivity arises. The N–N bond in these DAQs is a chiral axis. Even where both N-acyl groups are (S)-2-acetoxypropanoyl, the N–N bond is still a chiral axis because in the most stable conformation of the planar imide moiety, one exo/endo orientation of the carbonyl groups is much preferred over the alternative (endo/exo) as revealed by NMR spectroscopy. A conformational preference within the 2-acetoxypropanoyl grouping accounts for the presence of a single exo/endo conformation in solution for some of these DAQs (see above) but an interconverting exo/endo⇌endo/exo mixture for others. Where a single exo/endo conformation is present in solution, evidence is presented that this closely resembles the X-ray determined crystal structure. A mechanism for the second acylation step to form these DAQs is proposed, which involves preliminary O-acylation of the 3-(monoacylamino)quinazolinone.
Synthesis of unsymmetrical 3,3′-biquinazoline-2,2′-diones by condensation of 3-aminoquinazolinones with benzoxazinones; fortuitous discovery, and further syntheses of 4-H-3-oxo-1,9a,10-triazaanthracen-9-ones
作者:Michael P. Coogan、Li-ling Ooi、Fabrizio Pertusati
DOI:10.1039/b419108k
日期:——
2' disubstituted 3,3' biquinazoline-4,4'-diones. The reaction is tolerant to a range of heteroatom and unsaturated functionality in the quinazolinone 2-position. However, treatment of 3-amino-2-hydroxymethyl-3H-quinazolin-4-ones with benz[1,3]oxazinone at high temperatures gave 4H-3-oxo-1,9a,10-triazaanthracen-9-ones, an unreported fused heterocyclic system, a more direct synthesis of which, replacing
Synthesis of 2-Chirally Substituted 3,3′-Biquinazoline-4,4′-diones
作者:Fabrizio Pertusati、Michael P. Coogan
DOI:10.1002/jhet.1868
日期:2014.8
diastereoisomers, which can be enriched with the major diastereoisomer by simple recrystallization. The functional groups in the lateral chain can be easily modified allowing the synthesis of a variety of 3,3′-biquinazoline-4,4′-diones. The synthesis of symmetrically 2,2′ chirally disubstituted biquinazolinones via acylation/dehydration sequence of bisanthraniloyl hydrazine is also described.
一种通过手性缩合反应将手性中心并入其侧部附属物中的2-取代联喹唑啉酮的简便方法 描述了具有3-氨基-2 S-取代的喹唑啉-4-酮的4 H -3,1-苯并恶嗪-4-酮。该方法简单明了,不需要在任何阶段进行色谱纯化。以非对映异构体的混合物形式获得高收率的产物,可以通过简单的重结晶使其富含主要的非对映异构体。可以容易地修饰侧链中的官能团,从而允许合成各种3,3'-联喹唑啉-4,4'-二酮。对称的2,2'手性二取代联喹唑啉酮的酰化/脱水序列的合成。还描述了双蒽基酰肼。
3-(N,N-Diacylamino)quinazolin-4(3H)-ones as enantioselective acylating agents for amines
作者:Abdullah G Al-Sehemi、Robert S Atkinson、John Fawcett、David R Russell
DOI:10.1016/s0040-4039(00)00138-6
日期:2000.3
The presence of an N-N chiral axis in a 3-(N-benzoyl-N-isobutanoyl)aminoquinazolin-4(3H)-one (DAQ) bearing a chiral substituent in the 2-position of the quinazolinone allows separation of two enantiopure diastereoisomers; one of these diastereoisomers reacts with racemic 2-methylpiperidine to give (R)(+)-1-benzoyl-2-methylpiperidine (95% ee) and (S)-2-methylpiperidine (91% ee) even using stoichiometric quantities of reagents (1 equiv. DAQ: 2 equiv. amine). (C) 2000 Elsevier Science Ltd. All rights reserved.