A vinylogous urethane approach towards the synthesis of okadaic acid. Construction of the C1-C8 fragment. Part I
摘要:
A vinylogous urethane approach is utilized to synthesize the C1-C8 fragment of okadaic acid. The key steps include an asymmetric alkylation, a hydroxyl directed iodocarbonate cyclization and a stereoselective cyanohydrin formation. (C) 1998 Elsevier Science Ltd. All rights reserved.
A vinylogous urethane approach towards the synthesis of okadaic acid. Construction of the C1-C8 fragment. Part I
摘要:
A vinylogous urethane approach is utilized to synthesize the C1-C8 fragment of okadaic acid. The key steps include an asymmetric alkylation, a hydroxyl directed iodocarbonate cyclization and a stereoselective cyanohydrin formation. (C) 1998 Elsevier Science Ltd. All rights reserved.
Total synthesis of (+)-heteroplexisolide E has been demonstrated. The synthetic approach exploits the one-pot regioselective Negishi coupling (methylation) and transformation of a beta-methallyl alcohol moiety to a branched prenyl group via palladium-catalyzed hydrogenolysis. For the introduction of the 4-oxo-pentylidene side chain, two independent methods were devised: olefin cross metathesis (CM) (route A) and aldol condensation (route B).