The first catalyticenantioselective reaction of 2H-azirines with thiols has been developed. The obtained aziridines can be converted to optically active oxazolines, aziridylamides, or α-sulfonyl esters. Transformation of these optically active aziridines showed that 2H-azirines act as β,β-dicarbocationic amine synthons.
Diels–Alder reactions of alkyl 2H-azirine-3-carboxylates with furans
作者:M. José Alves、Nuno G. Azoia、Jamie F. Bickley、A. Gil Fortes、Thomas L. Gilchrist、Ricardo Mendonça
DOI:10.1039/b106985n
日期:——
the aziridine 2 by a Diels–Alder cycloaddition reaction. The hydrolysis of compound 2 leads to a dihydrofuranol 11 by cleavage of a C–N bond. X-Ray crystalstructures of compounds 2 and 11 have been determined. Compound 2 reacts with alcohols in a similar way to give 2-alkoxy-2,5-dihydrofurans as mixtures of cis and trans isomers. The structures of these compounds have been determined from an X-ray crystal
The enantioselective reaction of 2H-azirines with oxazol-5-(4H)-ones (oxazolones) using a cinchonaalkaloid sulfonamide catalyst has been developed. The reaction proceeded at the C-2 position of oxazolones to afford products with consecutive tetrasubstituted stereogenic centers in high yield with high diastereo- and enantioselectivity. The obtained aziridines were converted into various chiral compounds
Exploiting the Chemistry of Strained Rings: Synthesis of Indoles via Domino Reaction of Aryl Iodides with 2<i>H</i>-Azirines
作者:David A. Candito、Mark Lautens
DOI:10.1021/ol100975b
日期:2010.8.6
The highlystrained 2H-azirine ring system has been the source of considerable theoretical and synthetic work. The reaction of these strained heterocycles with transition metals has been documented to give rise to ring opening and subsequent formation of varied heterocycles. An interesting domino reaction is described wherein the strained bicyclic alkene, norbornene, mediates the reaction of 2H-azirines
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.