摘要:
Oligoamines 5, 6 and 7 with rigid 3-azabicyclo[3.1.0]hexyl building blocks were synthesized from di(chloroenamines) 8 and nucleophiles. Sodium borohydride as nucleophile led to endo,endo-tetramines 5a,b; the same stereochemical result generating 5d and 5f was observed for cyanide or methyllithium as reagents. Methylmagnesium bromide reacted with 8 to give mainly exo,exo-tetramine 7f besides small amounts of isomers 5f and 6f. Basicity, conformation and molecular flexibility of the new tetramines 5 - 7 were studied. X-Ray structural analyses pointed out a meander shape of tetramine 5f and a linear arrangement of tetramine 7f.