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.
(B2(Pin)2) to approach functionalized dibenzo[b,f][1,4]oxazepine derivatives is developed. The chiral products are obtained in up to 81% yield, >20:1 dr, and 98% ee when either a chiral diphosphine ligand or a chiral ferrocenyl‐based P,N‐ligand is used. Furthermore, the reaction exhibits reversed diastereoselectivities when the chiral diphosphine ligand and the chiral P,N‐ligand are used respectively.
作者:Liu Cai、Yu-Liang Pan、Li Chen、Jin-Pei Cheng、Xin Li
DOI:10.1039/d0cc05855f
日期:——
An efficient asymmetric allylation reaction of allylboronates with seven-membered cyclic imines, dibenzo[b,f][1,4]oxazepines, is described. The reaction, which is catalyzed by a Bi(OAc)3/CPA system, gives a range of chiral nitrogen-containing heterocycle structures in high yields and with good enantioselectivities. The conversion of these products to nitrogen-containing heterocycles is also demonstrated
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.