Enantioselective addition of Et2Zn to seven‐membered cyclic imines catalyzed by a (R)-VAPOL-Zn(II) complex
作者:Lode De Munck、Verena Sukowski、Carlos Vila、José R. Pedro
DOI:10.1016/j.tetlet.2017.07.042
日期:2017.8
substituted dibenzo[b,f][1,4]oxazepines underwent an enantioselective alkylation with Et2Zn catalyzed by a (R)-VAPOL-Zn(II) complex. The corresponding chiral 11-ethyl-10,11-dihydrodibenzo[b,f][1,4]oxazepine derivatives were obtained with good yields and moderate enantioselectivities. This represents the first example of enantioselectiveaddition of Et2Zn to cyclic aldimines.
Organocatalytic Asymmetric Mannich Addition of 3-Fluorooxindoles to Dibenzo[<i>b</i>,<i>f</i>][1,4]oxazepines: Highly Enantioselective Construction of Tetrasubstituted C–F Stereocenters
作者:Bing-Yu Li、Ye Lin、Da-Ming Du
DOI:10.1021/acs.joc.9b01507
日期:2019.9.20
application in medicinal chemistry. An organocatalyzed asymmetricMannichreaction of 3-fluorooxindoles with dibenzo[b,f][1,4]oxazepines affording various seven-member cyclic amines containing chiral tetrasubstituted C–F stereocenters was developed. These reactions which were catalyzed by a bifunctional Cinchona alkaloid-derived thioureacatalyst afforded a wide range of substrates in moderate to high
Organocatalytic Enantioselective Strecker Reaction with Seven-Membered Cyclic Imines
作者:Carles Lluna-Galán、Gonzalo Blay、Isabel Fernández、M. Carmen Muñoz、José R. Pedro、Carlos Vila
DOI:10.1002/adsc.201800754
日期:2018.10.4
A highly enantioselective Strecker reaction with dibenzo[b,f][1,4]oxazepines has been described using a dihydroquinine‐derived thiourea as organocatalyst. The reaction affords chiral 10,11‐dihydrodibenzo[b,f][1,4]oxazepine 11‐carbonitrile derivatives in excellent yields (up to 99%) and excellent enantioselectivities (up to 98%) under mild reaction conditions.
Annulation of Diaryl(aryl)phosphenes and Cyclic Imines to Access Benzo-δ-phospholactams
作者:Yun Luo、Jiaxi Xu
DOI:10.1021/acs.orglett.0c02346
日期:2020.10.16
Microwave-assisted annulation of cyclicimine dibenzo[b,f][1,4]oxazepines and diaryl(aryl)phosphenes generated from diazo(aryl)methyl(diaryl)phosphine oxides through the Wolff rearrangement accesses pentacyclic benzo-δ-phospholactams, 4b,16-dihydrodibenzo[b,f]benzo[4,5][1,2]azaphosphinino[1,6-d][1,4]oxazepine 15-oxides, in good yields.
Preparation of the eight monohydroxydibenz[b,f][1,4]oxazepin-11(10H)-ones
作者:Keith Brewster、Raymond J. Clarke、John M. Harrison、Thomas D. Inch、David Utley
DOI:10.1039/p19760001286
日期:——
The eight possible isomeric monohydroxydibenz[b,f][1,4]oxazepin-11(10H)-ones have been prepared and their mass spectra determined. With the exception of the 7-hydroxy-derivative the fragmentation patterns of the isomers were similar, although the relative line intensities allowed distinctions between the isomers to be made. The syntheses of several irritant monomethoxydibenz[b,f][1,4]oxazepines are