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Base- and Catalyst-Induced Orthogonal Site Selectivities in Acylation of Amphiphilic Diols.

Natali AshushReut FallekAmit FallekRoman DobrovetskyMoshe Portnoy
Published in: Organic letters (2020)
Seeking to selectively functionalize natural and synthetic amphiphiles, we explored acylation of model amphiphilic diols. The use of a nucleophilic catalyst enabled a remarkable shift of the site selectivity from the polar site, preferred in background noncatalyzed or base-promoted reactions, to the apolar site. This tendency was significantly enhanced for organocatalysts comprising an imidazole active site surrounded by long/branched tails. An explanation of these orthogonal modes of selectivity is supported by competitive experiments with monoalcohol substrates.
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