Synthesis of the first lariat crown-formazan, prototype of a new series of podandocoronands
摘要:
Crown-formazan (1) with a pendant hydroxy group was obtained by a phase-transfer assisted ate-coupling reaction. Acylation of the hydroxy group of (1) with 2-chloroacetyl chloride followed by reaction with dimethylamine afforded 13-[2-(N,N-dimethylamino)acetoxy]-16,17-dihydro-7-phenyl-5H,15-dibenzo[b,il[l,ll ,4,5,7,8]dioxatetraazacyclotetradecyne (8), the first lariat crown-formazan containing a strong donor group as a supporting ligand at the end of the side arm.