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 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.
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
Solvent-controlled and selective synthesis of mono- and bis-indolyl products in Brønsted acid catalyzed aza-Friedel–Crafts reactions of indoles with cyclic imines
dibenzo[b,f][1,4]oxazepines with various indoles have been carried out. In the presence of 10 mol % trifluoroacetic acid (TFA), the selectivity of this reaction can be controlled in different solvents, affording mono-indole substituted products in THF and bis-indole substituted products in DCM as major products. Unsymmetric bis-indole substituted products can be obtained via a sequential procedure. Structurally