Synthesis of alkyl 4-alkyl-2-hydroxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylates as peptidomimetic building blocks
摘要:
A general synthesis of new alkyl 4-alkyl-2-hydroxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylate peptidomimetic building blocks from the corresponding alkyl 3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylates through carbanion oxidation is described. (C) 2003 Elsevier Ltd. All rights reserved.
A synthesis of alkyl 4-alkyl-2-hydroxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylates
摘要:
Reaction of ethyl 4-alkyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylates with sodium hydride in dioxane affords ethyl 4-alkyl-2-hydroxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylates. The structure of the products was unambiguously established by X-ray analysis as well as by H-1-C-13 and H-1-N-15 NMR correlation spectroscopy. (C) 2001 Published by Elsevier Science Ltd.