1-(4-Nitrophenoxycarbonyl)-7-pyridin-4-yl indolizine: a new versatile fluorescent building block. Application to the synthesis of a series of fluorescent β-cyclodextrins
The synthesis of a series of new fluorescentbuildingblocks 1a–d incorporating a pyridinoindolizine unit and two potentially reactive sites is described. The reaction of 1a–d with the mono-6-amino-6-deoxy-β-cyclodextrin provides the corresponding fluorescent water soluble hosts 2a–d in good yield. The sensor properties of 2a–d in the presence of 1-adamantanol is described.