Chemical and enzymatic synthesis of buprestin A and B—bitter acylglucosides from Australian jewel beetles (Coleoptera: Buprestidae)
摘要:
A chemical and enzymatic synthesis was developed for buprestin A and B originally isolated from Australian jewel beetles (Coleoptera: Buprestidae). The common motif of both acylglucosides is a beta-D-glucopyranose-1,2-bis(pyrrole-2-carboxylate). Starting from 1,3,4,6-tetra-O-acetyl-alpha-D-glucose, the first pyrrole-2-carboxylate was introduced by DCC-DMAP mediated esterification. After conversion to a trichloroacetimidate the anomeric pyrrole-2-carboxylate was installed. Selective removal of the acetates was accomplished using immobilized Candida antarctica lipase. The resulting triol was converted to Buprestin A or B via a Mitsunobu reaction. (c) 2006 Elsevier Ltd. All rights reserved.
Chemical and enzymatic synthesis of buprestin A and B—bitter acylglucosides from Australian jewel beetles (Coleoptera: Buprestidae)
摘要:
A chemical and enzymatic synthesis was developed for buprestin A and B originally isolated from Australian jewel beetles (Coleoptera: Buprestidae). The common motif of both acylglucosides is a beta-D-glucopyranose-1,2-bis(pyrrole-2-carboxylate). Starting from 1,3,4,6-tetra-O-acetyl-alpha-D-glucose, the first pyrrole-2-carboxylate was introduced by DCC-DMAP mediated esterification. After conversion to a trichloroacetimidate the anomeric pyrrole-2-carboxylate was installed. Selective removal of the acetates was accomplished using immobilized Candida antarctica lipase. The resulting triol was converted to Buprestin A or B via a Mitsunobu reaction. (c) 2006 Elsevier Ltd. All rights reserved.
A chemical and enzymatic synthesis was developed for five variant buprestins termed D, E, F, G and H found in jewel beetles (Coleoptera: Buprestidae). Selective acylation of the primary hydroxyl group of β-d-glucopyranose-1,2-bis(pyrrole-2-carboxylate) with substituted benzoic or cinnamic acid derivatives followed by deprotection gave the target compounds. Using coinjection the identity with the natural