Synthesis of [1α,2β,3α-2,3-bis(benzyloxymethyl)cyclobutyl]imidazol-5-amines: important precursors to cyclobut-A derivatives
作者:Brian L. Booth、Paul R. Eastwood
DOI:10.1039/p19950000669
日期:——
the synthesis of cyclobutane-based carbocyclic nucleosides. It can be readily converted by base treatment into the 4-cyanoimidazol-5-amine derivative 4b; a precursor to the dibenzoyl derivative of racemic Cyclobut-A and a new 1-amino-6-iminopurine derivative 25. Treatment of compound 19 with a catalytic amount of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) afforded the previously unknown 5-amino-4-(cy