Reactions of Unsaturated Azides; Part 27:¹ Synthesis of 1,4-Diazidobuta-1,3-dienes
作者:Klaus Banert、Frank Köhler、Antje Melzer、Ingolf Scharf、Gerd Rheinwald、Tobias Rüffer、Heinrich Lang
DOI:10.1055/s-0030-1260000
日期:2011.5
assignment of the diastereomeric products was possible, and some sequential reactions, such as reduction or 1,3-dipolar cycloaddition of the azido groups, were performed. allenes - alkynes - azides - cycloaddition - dienes - isomerisation - nucleophilic addition - nucleophilic substitution
Experimental and Theoretical Characterization of the Aromatization, Epimerization, and Fragmentation Reactions of Bi-2H-azirin-2-yls Prepared from 1,4-Diazidobuta-1,3-dienes
isomerization were postulated. In the case of meso‐ and rac‐22, nearly quantitative formation from diazide 21, isolation as stable solids, and complete characterization were possible. On the thermolysis of 22, aromatization to 23 was only a side reaction, whereas equilibration of meso‐ and rac‐22 and fragmentation, which led to alkyne 24 and acetonitrile, dominated. Prolonged irradiation of 22 gave mainly