Catalytic Enantioselective Aza-Benzoin Reactions of Aldehydes with 2<i>H</i>
-Azirines
作者:Qiupeng Peng、Donghui Guo、Jianbo Bie、Jian Wang
DOI:10.1002/anie.201712785
日期:2018.3.26
The unprecedented enantioselective aza‐benzoin reaction of aldehydes with 2H‐azirines was developed by utilizing a chiral N‐heterocyclic carbene as the catalyst. A wide range of corresponding aziridines can be obtained in good yields with high enantioselectivities. The obtained optically active aziridines should be useful in the synthesis of other valuable molecules.
Diastereoselective Lewis acid-catalysed [4+2] cycloadditions of 3-alkyl-, 3-aryl- and 3-carboxyl-2H-azirines: a route to aziridine containing azabicyclo[4.1.0]heptanes and azatricyclo[2.2.1.0]nonanes
作者:Colin A Ray、Erik Risberg、Peter Somfai
DOI:10.1016/s0040-4020(02)00611-7
日期:2002.7
3-Substituted-2H-azirines have been employed as 2π components in Lewis acid-catalysed hetero Diels–Alder reactions with a variety of diene systems. A series of Lewis acids were screened for catalytic behaviour in the reaction between Danishefsky's diene and 3-phenyl-2H-azirine to give the cycloaddition adduct, and in most cases elevated temperature were required to effect cycloaddition. A noteworthy
Improved procedure for cyclization of vinyl azides into 3-substituted-2H-azirines
作者:Åsa Sjöholm Timén、Erik Risberg、Peter Somfai
DOI:10.1016/s0040-4039(03)01205-x
日期:2003.7
A significantly improved procedure for the preparation of 3-substituted 2H-azirines has been developed. By cyclization of the corresponding vinyl azides in low boiling solvents in closed vessels at elevated temperature, high purity, short reaction time and simple isolation of the product were achieved.
The firstcatalytic asymmetric synthesis of C-silylated, unprotected aziridines has been accomplished. Using a silyl boronic ester as a latent silicon nucleophile, a chiral copper catalyst enables its addition of 3-substituted 2H-azirines in high yields and with excellent enantioselectivities. These azirines can be considered strained cyclic and hence reactive ketimines, for which an effective silylation
Enantio- and Diastereoselective Copper-Catalyzed Synthesis of Chiral Aziridines with Vicinal Tetrasubstituted Stereocenters
作者:Fang Xie、Jie Zhao、Deyue Ren、Jianming Xue、Jingyi Wang、Qin Zhao、Lu Liu、Xiaodan Liu
DOI:10.1021/acs.orglett.3c03565
日期:2023.12.1
mild conditions. This novel protocol features a broad substrate scope and good functional group compatibility, and it enriches the existing reaction type of rapid synthesis of optically active aziridines bearing vicinaltetrasubstituted stereogenic carbon centers.