Ring Opening of 1-Azabicyclo[1.1.0]butanes with Hydrazoic Acid - a Facile Access toN-Unsubstituted Azetidin-3-Amines
作者:Grzegorz Mlostoń、Małgorzata Celeda
DOI:10.1002/hlca.200590130
日期:2005.7
Sterically congested 1-azabicyclo[1.1.0]butanes 1 add hydrazoicacid smoothly at 0–5°, giving 3-azidoazetidines 2 in good to excellent yields. After hydrogenolysis over Pd/C catalyst, compounds 2 were converted into N-unsubstituted azetidin-3-amines 4. Attempted reduction of 2a with Raney-Ni led to a mixture of the expected azetidin-3-amine 4a and the ring-enlarged 2,5-dihydro-1H-imidazole derivative