A newphotochromic colorant with an oxazabicyclic moiety has been synthesized by an efficient method. It turns pale red upon UV irradiation and undergoes reverse reaction while being heated. This work may open an exciting new avenue for future development of the photochromic dyes with novel molecular structures.
Synthesis and characterization of coumarin and dimedone-derived diazabicycles
作者:Jiun-Ting Lai、Pei-Yu Kuo、Yung-Her Gau、Ding-Yah Yang
DOI:10.1016/j.tetlet.2007.09.006
日期:2007.10
synthesis involved the acid-catalyzed coupling of 4-aminocoumarin or dimedone derivatives with amino alcohols 3 or 7 to give the ring-opened forms 4, 10, 12 and the ring-closed diazabicycles 5, 6, 9, 11. When 4-alkylaminocoumarins were used as the coupling reagents, the majorcyclizedproduct was N-dealkylated diazabicycle 5, rather than the corresponding N-alkylated products. Alternatively, compound