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Selectivity enhancements in the base-catalyzed acylation of polyols (1,2- or 1,3-alkanediol, partially protected glucoside) have been found with (bi)macrocyclic pyridines 2 and 9 as catalysts. The different selectivities obtained for concave pyridines of varying ring sizes (1 vs. 2) are probably caused by their different geometries as a number of X-ray analyses (1a, 1b, 2a, 2b, 2e, 9) indicate. The methyl glucoside 7 can selectively be acylated in 2-position.
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Lüning et al. (1998) studied this question.
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