Enantioselective Synthesis of β2-Amino Acids via Rh-Catalyzed Asymmetric Hydrogenation with BoPhoz-Type Ligands: Important Influence of an N−H Proton in the Ligand on the Enantioselectivity
摘要:
[GRAPHICS]A series of BoPhoz-type ligands were successfully applied in the rhodium-catalyzed asymmetric hydrogenation of a number of P-substituted or unsubstituted alpha-(phthalimidomethyl)acrylates, affording good to excellent enantioselectivities. The results suggested that the presence of an N-H proton in the BoPhoz backbone could significantly improve the enantioselectivity, and ligand (S-c,R-p)-1d, bearing two CF3-groups in the 3,5-position of the phenyl ring of aminophosphino moiety, showed the highest enantioselectivity.
Electrochemical Synthesis of Allylamines via a Radical Trapping Sequence
作者:Cao‐Cao Sun、Fei Lian、Kun Xu、Cheng‐Chu Zeng、Bao‐Guo Sun
DOI:10.1002/adsc.201900537
日期:2019.9.3
oxidative addition of sulfonamides and imide to allyl sulfones was developed for the facilesynthesis of synthetically useful allylamines. This method avoids the use of transition metal catalysts and additional bases, which are commonly used for the synthesis of allylamines. Moreover, cheap and easily available NaI was employed as the mediator without use of an external supporting electrolyte. Radical
Highly Enantioselective Intermolecular Stetter Reaction of Simple Acrylates: Synthesis of α-Chiral γ-Ketoesters
作者:Nathalie E. Wurz、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/chem.201202432
日期:2012.12.14
Simple Stetter: A novel N‐heterocyclic carbene (NHC) was designed by combining an electron‐rich 2,6‐dimethoxy substituent and an underestimated yet promising chiral motif. With this NHC in hand, a highlyenantioselectiveintermolecularStetterreaction of simple acrylates was developed, yielding versatile α‐chiral γ‐ketoesters. This represents the first catalytic asymmetric route towards these valuable
A novel photoinduced intermolecular 1,2-arylheteroarylation of alkenes and the efficient synthesis of valuable polyarylalkanes are reported. The reaction is operationally simple, proceeds under mild conditions and with no additional catalyst and reagents. The strategically designed radical cascade reaction is enabled by electron transfer, and involves cleavage of an inert C-C bond. The process features broad functional group compatibility as well as high product transformability.
Heavyweight “R-SMS-Phos” Ligands in the Olefins’ Hydrogenation Arena
作者:Borut Zupančič、Barbara Mohar、Michel Stephan
DOI:10.1021/ol100184p
日期:2010.3.19
A series of enantiopure P-stereogenic 1,2-bis[(o-RO-phenyl)(phenyl)phosphino]ethane (R-SMS-Phos) ligands wherein R= i-Pr, i-Bu, t-Bu, 3-Pen, and CH2TMS was assessed in the Rh(I)-catalyzed hydrogenation of an indicative set of olefins. The best performing t-Bu-SMS-Phos ligand was screened against a wide range of representative classes of standard and new olefinic substrates such as dehydroamido esters
一系列对映纯的P-立体异构1,2-双[(o -RO-苯基)(苯基)膦基]乙烷(R-SMS-Phos)配体,其中R = i -Pr,i -Bu,t -Bu,3 -苯和CH 2 TMS是在Rh(I)催化的一组指示性烯烃的氢化反应中评估的。表现最佳吨-Bu-SMS-PHOS配体筛选对宽范围的代表类标准和新的烯烃底材如dehydroamido酯,脱氢α酰氨基膦酸酯,烯酰胺,衣康酸酯,丙烯酸酯,乙烯醇的,α-苯甲酸磷新戊酯,α-(2-吡啶基N-氧化物)苯乙烯和α-(1-羟亚氨基乙基)苯乙烯。在温和的条件下可获得出色的对映选择性和高TOF。
Synthesis, crystal structure, Hirshfeld surface analysis, DFT investigation, and molecular docking, of novel organic dithiocarbamates obtained from Baylis-Hillman adducts/alcohols at room temperature
growth via intermolecularinteractions in their crystallattices was investigated theoretically using Hirshfeld surface analysis and corresponding two-dimensional fingerprint plots, in addition to compound interaction energy estimations. To assess the likely interactions and mode of binding of the recently synthesized compounds 4 w to the E. coli nitroreductase enzyme, a molecular docking study was
利用包括 CS、几种仲胺和 Baylis-Hillman 加合物/醇的一锅多组分反应,在乙醇水溶液中合成了许多新型有机二硫代氨基甲酸酯。由于反应时间短、收率高,该方法简单、环保且经济,可在室温下生成具有生物学意义的二硫代氨基甲酸盐。除了化合物相互作用能量估计之外,还使用赫什菲尔德表面分析和相应的二维指纹图从理论上研究了通过晶格中的分子间相互作用进行晶体结构生长的驱动力。为了评估最近合成的化合物 4 w 与大肠杆菌硝基还原酶的可能相互作用和结合模式,还进行了分子对接研究。[显示省略]