The synthesis of an enantiomeric pair of enaminoesters from phenylglycine is described. Conjugate addition to alpha,beta-enones, reductive cyclization-fragmentation to octahydroimidazopyridines and further reduction to remove the auxiliary atoms, completes a new route to homochiral piperidines in which the enaminoesters function as homochiral 'ethanal enamines'.
The synthesis of an enantiomeric pair of enaminoesters from phenylglycine is described. Conjugate addition to alpha,beta-enones, reductive cyclization-fragmentation to octahydroimidazopyridines and further reduction to remove the auxiliary atoms, completes a new route to homochiral piperidines in which the enaminoesters function as homochiral 'ethanal enamines'.
Cycloaddition of homochiral dihydroimidazoles: A 1,3-dipolar cycloaddition route to optically active pyrrolo[1,2-a]imidazoles
作者:Raymond C. F. Jones、Kevin J. Howard、John S. Snaith、Alexander J. Blake、Wang-Shei Li、Peter J. Steel
DOI:10.1039/c0ob00529k
日期:——
terminating in a 1,3-dipolarcycloadditionreaction that affords optically active pyrrolo[1,2-a]imidazoles. Three bonds of the so-formed pyrrolidine moiety are constructed in this cascade. The cycloaddition follows an endo approach of dipole and dipolarophile with anti geometry of the dipole and facial selectivity derived from the phenyl substituent. Inter- and intramolecularcycloaddition modes are observed
N-光学活性的烷基化1-苄基-4-苯基-4,5-二氢咪唑活性烷基卤化物和在一系列缺电子的烯烃双极性亲和剂存在下用DBU处理如此形成的4,5-二氢咪唑鎓离子,构成终止于1,3-偶极环加成反应的``一锅''级联反应提供光学活性的吡咯并[1,2- a ]咪唑。在该级联反应中构建了如此形成的吡咯烷部分的三个键。环加成遵循内偶极子和亲偶极与方法抗偶极子的几何形状,并从苯基取代基衍生的面部选择性。观察到分子间和分子内的环加成模式。
Ruthenium Pybox-Catalyzed Enantioselective Intramolecular C–H Amination of Sulfamoyl Azides en Route to Chiral Vicinal Diamines
作者:Xin Nie、Zihan Yan、Sergei Ivlev、Eric Meggers
DOI:10.1021/acs.joc.0c02279
日期:2021.1.1
Enantioselective C(sp3)–H aminations allow an efficient access to nonracemic chiral amines. This work reports the catalytic asymmetric synthesis of chiral 1,2,5-thiadiazolidine-1,1-dioxides by an enantioselective ring-closing 1,5-C–H amination of sulfamoyl azides. The reaction is catalyzed by a recently introduced simple chiral ruthenium bis(oxazoline) (pybox) complex ( Angew. Chem. Int. Ed. 2020,
Zinc‐Catalyzed Enantioselective [3+2] Cycloaddition of Azomethine Ylides Using Planar Chiral [2.2]Paracyclophane‐Imidazoline N,O‐ligands
作者:Sundaravel Vivek Kumar、Patrick J. Guiry
DOI:10.1002/anie.202205516
日期:2022.8.15
novel [2.2]paracyclophane-derived ligands (UCD-IMPHANOL) possessing central chirality and planar chirality has been developed. These ligands demonstrated excellent enantioselectivities in the asymmetric Zn-catalyzed azomethineylidecycloaddition.
Pyrazolo-quinazoline derivatives, process for their preparation and their use as kinase inhibitors
申请人:Nerviano Medical Sciences S.R.L.
公开号:US10280176B2
公开(公告)日:2019-05-07
Pyrazolo-quinazoline derivatives of formula (Ia) or (Ib) as defined in the specification, and pharmaceutically acceptable salts thereof, process for their preparation and pharmaceutical compositions comprising them are disclosed; the compounds of the invention may be useful, in therapy, in the treatment of diseases associated with a disregulated protein kinase activity, like cancer.
Cycloaddition of homochiral imidazolinium ylides: A route to optically active pyrroloimidazoles
作者:Raymond CF Jones、Kevin J Howard、John S Snaith
DOI:10.1016/0040-4039(96)00113-x
日期:1996.3
The synthesis of either enantiomer of 1-benzyl-4-phenyl-2-imidazoline from phenylglycine is described. 'One-pot' generation and enantioselective 1,3-dipolar cycloaddition of homochiral azomethine ylides prepared from these imidazolines with a range of alkene dipolarophiles affords optically active hexahydropyrroloimidazole adducts.