名称:
Enantioselective synthesis of ethyl 6-substituted-2,3,3a,4,5,6-hexahydro-1H-indolo[3,2,1-de][1,5]naphthyridine-2-carboxylates from tryptophan
摘要:
Optically pure ethyl 6-substituted-2,3,3a,4,5,6-hexahydro-1H-indolo[3,2,1-de][1,5]naphthyridine-2-carboxylates (6-9) have been prepared from ethyl 6-benzotriazolyl-2,3,3a,4,5,6-hexahydro-1H-indolo[3,2,1-de][1,5]naphthyridine-2-carboxylate (5), itself obtained from the reaction of the ethyl ester of L-tryptophan with benzotriazole and 2,5-dimethoxytetrahydrofuran. (C) 1999 Elsevier Science Ltd. All rights reserved.