Asymmetric Alkynylation of Seven-Membered Cyclic Imines by Combining Chiral Phosphoric Acids and Ag(I) Catalysts: Synthesis of 11-Substituted-10,11-dihydrodibenzo[<i>b</i>,<i>f</i>][1,4]oxazepine Derivatives
作者:Yuan-Yuan Ren、You-Qing Wang、Shuang Liu
DOI:10.1021/jo5022037
日期:2014.12.5
Asymmetric alkynylation of seven-membered cyclic imine dibenzo[b,f][1,4]oxazepines is successfully achieved by combining chiral phosphoric acid and Ag(I) catalysts. Various arylacetylenes, conjugated enynes, and terminal 1,3-diynes are good substrates for this reaction, and aliphatic hexyne is also a suitable donor at elevated temperature. Optimization of this approach has provided a facile method
Efficient Construction of Tetracyclic 1,2,4‐Triazoline‐Fused Dibenzo[
<i>b,f</i>
][1,4]oxazepines through KI/TBHP‐Mediated [3+2] Annulation between DBO‐Imines and
<i>N</i>
‐Tosylhydrazones
straightforward protocol for 1,2,4-triazoline-fused dibenzo[b,f][1,4]oxazepines is effectively established throughKI/TBHP-promoted [3+2] annulationbetweendibenzo[b,f][1,4]oxazepine-imines and N-tosylhydrazones under mild conditions. The produced 1,2,4-triazoline-fused DBOs could be easily converted into biologically interesting 1,2,4-triazolo-fused DBOs with excellent yields
Stereoselective Oxidative Mannich Reaction of Ketones with Dihydrodibenzo‐Oxazepines via a Merger of Photoredox‐/Electro‐Catalysis with Organocatalysis
Goodbye Tear Gas: The merger of Proline catalysis with organic photoredoxcatalysis or electrocatalysis provides an alternative strategy for synthesizing enantioenriched dihydrodibenzo[b,f][1,4]oxazepine derivatives by eliminating the direct use of toxic CR gas. Good yields and excellent stereoselectivities have been achieved under mild reaction conditions involving abundant and green sources.
[4+2] Annulation of arylmethylphosphonochloridates with dibenzo[<i>b</i>,<i>f</i>][1,4]oxazepines: a practical approach to polycyclic benzo-δ-phosphonolactams
作者:Xin Yuan、Yelong Lei、Zhicheng Fu、Jiaxi Xu
DOI:10.1039/d2nj05558a
日期:——
A novel and transition metal-free synthesis of benzo-δ-phosphonolactams from readily available ethyl arylmethylphosphonochloridates and dibenzo[b,f][1,4]oxazepines was developed. The reaction includes tandem phosphonylation, deprotonation, intramolecular nucleophilic addition, and aromatization, affording various polycyclic benzo-δ-phosphonolactams in moderate to good yields and diasteroselectivity
从现成的乙基芳基甲基膦酰氯和二苯并 [ b , f ][1,4]oxazepine 开发了一种新的无过渡金属合成苯并-δ-膦内酰胺。该反应包括串联膦酰化、去质子化、分子内亲核加成和芳构化,以中等至良好的产率和一锅法的非对映选择性(高达 96% 的产率和 83:17 dr)提供各种多环苯并-δ-膦内酰胺。
WARDROP A. W. H.; SAINSBURY G. L.; HARRISON J. M.; INCH T. D., J. CHEM. SOC. PERKIN TRANS., PART 1, <JCPK-BH>, 1976, NO 12, 1279-1285
作者:WARDROP A. W. H.、 SAINSBURY G. L.、 HARRISON J. M.、 INCH T. D.