[3,3]-Sigmatropic Rearrangement/Allylboration/Cyclization Sequence: Enantioenriched Seven-Membered-Ring Carbamates and Ring Contraction to Pyrrolidines

被引:18
|
作者
Mace, Aurelie [1 ]
Touchet, Sabrina [1 ]
Andres, Patricia [1 ]
Cossio, Fernando [2 ,3 ]
Dorcet, Vincent [1 ]
Carreaux, Francois [1 ]
Carboni, Bertrand [1 ]
机构
[1] Univ Rennes 1, CNRS, UMR 6226, Inst Sci Chim Rennes, F-35042 Rennes, France
[2] Univ Basque Country, Fac Quim, Dept Quim Organ 1, San Sebastian 20018, Donostia, Spain
[3] DIPC, San Sebastian 20018, Donostia, Spain
关键词
allylic compounds; asymmetric synthesis; heterocycles; reaction mechanisms; rearrangements; VERSATILE BUILDING-BLOCKS; INTERMOLECULAR ADDITION-REACTIONS; STEREOSELECTIVE-SYNTHESIS; HOMOALLYLIC ALCOHOLS; ASYMMETRIC-SYNTHESIS; DERIVATIVES; AMINO; INHIBITORS; ARYLATION; IONS;
D O I
10.1002/anie.201509824
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The combination of in situ generated -isocyanato allylboronic esters and aldehydes afforded seven-membered-ring enecarbamates with high levels of diastereo- and enantiocontrol. They were easily converted into diversely substituted 1,3-oxazepan-2-ones. An unprecedented rearrangement of 5-acetoxy-7-aryl or styryl derivatives led to tetrasubstituted pyrrolidines. A computational study provides evidence on the feasibility of the proposed mechanism of this unusual ring contraction.
引用
收藏
页码:1025 / 1029
页数:5
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