SYNTHESIS, EXTRACTION ABILITY AND APPLICATION IN ASYMMETRIC-SYNTHESISOF AZACROWN ETHERS DERIVED FROM D-GLUCOSE

A number of new chiral monoaza-15-crown-5 derivatives (4-9) and lariat ethers (10-15) anellated to phenyl-beta-D-glucopyranoside have been s ynthesized. Their extracting ability was measured with alkali metal (L i, Na, K) and ammonium cations. The derivatives show significant asymm etric induction as phase transfer catalysts in the Michael addition of 2-nitropropane to chalcone (82% ee) although in low yield, and in the Darzens condensation of phenacyl chloride with benzaldehyde (74% ee). The substituent at the nitrogen atom of the crown ethers has a major influence on both the extraction ability and the enantioselectivity. ( C) 1998 Elsevier Science Ltd. All rights reserved.