作者:Bao-Yong Hou、Qi-Yu Zheng、De-Xian Wang、Mei-Xiang Wang
DOI:10.1016/j.tet.2007.05.129
日期:2007.10
This paper describes our attempts to synthesize inherently chiral heteroatom-bridged calixaromatics. Based on a stepwise fragment-coupling approach using a chiral 3,5-dihydroxybenzamide or benzoate, 2,4-dihydroxyacetophenone, and cyanuric chloride as reactants, chiral tetraoxacalix[2]arene[2]triazine derivatives 16 and 17 were synthesized in good yields. Subsequent macrocyclic condensation with a diamine 6 furnished efficiently the pairs of diastereomers of inherently chiral tetraoxacalix[2]arene[2]triazine azacrowns 18 and 19. (C) 2007 Elsevier Ltd. All rights reserved.