Peptide ligation by chemoselective aminonitrile coupling in water
作者:Pierre Canavelli、Saidul Islam、Matthew W. Powner
DOI:10.1038/s41586-019-1371-4
日期:2019.7
N-to-C peptide ligation. Our model unites prebiotic aminonitrile synthesis and biological α-peptides, suggesting that short N-acyl peptide nitriles were plausible substrates during early evolution.Prebiotic peptide formation is achieved through chemoselective, high-yielding ligation of α-aminonitriles in water, showing selectivity for α-peptide coupling and tolerance of all proteinogenic amino acid residues
Carbohydrates as efficient catalysts for the hydration of α-amino nitriles
作者:Sampada Chitale、Joshua S. Derasp、Bashir Hussain、Kashif Tanveer、André M. Beauchemin
DOI:10.1039/c6cc07530d
日期:——
Directed hydration of alpha-amino nitriles was achieved under mild conditions using simple carbohydrates as catalysts exploiting temporary intramolecularity. A broadly applicable procedure using both formaldehyde and NaOH as catalysts efficiently hydrated a variety of primary and secondary susbtrates, and allowed the hydration of enantiopure substrates to proceed without racemization. This work also
Prebiotic selection and assembly of proteinogenic amino acids and natural nucleotides from complex mixtures
作者:Saidul Islam、Dejan-Krešimir Bučar、Matthew W. Powner
DOI:10.1038/nchem.2703
日期:2017.6
permits ribonucleotide synthesis, even from complex sugar mixtures. Remarkably, aminal formation also overcomes the thermodynamically favoured isomerization of glyceraldehyde into dihydroxyacetone because only the aminal of glyceraldehyde separates from the equilibrating mixture. Finally, we show that aminal formation provides a novel pathway to amino acids that avoids the synthesis of the non-proteinogenic
Facile Access to 1,4-Disubstituted Pyrrolo[1,2-a]pyrazines from α-Aminoacetonitriles
作者:Ananta Karmakar、Sridharan Ramalingam、Mushkin Basha、Gopi Kumar Indasi、Makonen Belema、Nicholas A. Meanwell、T. G. Murali Dhar、Richard Rampulla、Arvind Mathur、Anuradha Gupta、Arun Kumar Gupta
DOI:10.1055/s-0039-1690699
日期:2020.2
An efficient and practical synthetic protocol for the synthesis of 1,4-disubstituted pyrrolo[1,2-a]pyrazine derivatives is described that originates from α-substituted pyrroloacetonitriles which, in turn, are readily available from aryl and alkyl aldehydes. The α-pyrroloacetonitriles were subjected to a Friedel–Crafts acylation with methyl chlorooxoacetate followed by reduction of the nitrile group
描述了一种用于合成1,4-二取代的吡咯并[1,2- a ]吡嗪衍生物的有效且实用的合成方案,其源自α-取代的吡咯并乙腈,而α-取代的吡咯并乙腈可容易地从芳基和烷基醛获得。将α-吡咯乙腈与氯氧乙酸甲酯进行Friedel-Crafts酰化反应,然后在Pd催化的氢化条件下还原腈基,最后用DDQ进行芳构化,得到所需的吡咯并[1,2- a]吡嗪衍生物。该方法被普遍化并成功地应用于各种芳基,杂芳基和烷基底物。所开发的方案可直接且方便地以中等至良好的总收率(51–68%)访问1,4-二取代的环系统,而无需纯化中间体。还证明了通过逐步卤化(溴化,碘化)和硝化的进一步官能化。另外,通过操作成杂环系统证明了酯官能化的潜力,例如通过转化为苯并恶唑衍生物。
[EN] COMPOUNDS AS MODULATORS OF ROR GAMMA<br/>[FR] COMPOSÉS UTILISÉS COMME MODULATEURS DE ROR GAMMA
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2015160654A1
公开(公告)日:2015-10-22
The present invention encompasses compounds of the formula (I) wherein the variables are defined herein which are suitable for the modulation of RORγ and the treatment of diseases related to the modulation of RORγ. The present invention also encompasses processes of making compounds of formula (I) and pharmaceutical preparations containing them.