Michael addition of gamma-amino alcohol 2 to alkynone 3 affords enamine 4, which is converted into cyclic enamine 6 through its bromide 5. Diastereoselective hydrogenation of 6 followed by protection and epimerization provides piperidine 8. Baeyer-Villiger oxidation of 8 and the subsequent deprotection give (-)-deoxoprosophylline. (C) 2003 Elsevier Science Ltd. All rights reserved.
Michael addition of gamma-amino alcohol 2 to alkynone 3 affords enamine 4, which is converted into cyclic enamine 6 through its bromide 5. Diastereoselective hydrogenation of 6 followed by protection and epimerization provides piperidine 8. Baeyer-Villiger oxidation of 8 and the subsequent deprotection give (-)-deoxoprosophylline. (C) 2003 Elsevier Science Ltd. All rights reserved.
Michael addition of gamma-amino alcohol 2 to alkynone 3 affords enamine 4, which is converted into cyclic enamine 6 through its bromide 5. Diastereoselective hydrogenation of 6 followed by protection and epimerization provides piperidine 8. Baeyer-Villiger oxidation of 8 and the subsequent deprotection give (-)-deoxoprosophylline. (C) 2003 Elsevier Science Ltd. All rights reserved.