Steroidal Ureas as Enantioselective Receptors for an N-Acetyl α-Amino Carboxylate

Abstract
Cholic acid has been elaborated into three regioisomeric bis-carbamoylureas, which have been investigated as enantioselective receptors for N-acetyl phenylalanine. l/d selectivities, peaking at 5:1, have been determined by a sensitive and rapid MS-based extraction method that should be generalizable to related systems.

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