Multicomponent synthesis of epoxy-tetrahydronaphthyridine and structural diversification by subsequent fragmentation
作者:Aude Fayol、Jieping Zhu
DOI:10.1016/j.tet.2005.09.017
日期:2005.11
Three-component reaction of an alpha-isocyanoacetamide 7, an homoallylamine 8 and an aldehyde 9 in methanol at room temperature provides oxa-bridged tricycle 4 in good to excellent yield as a mixture of two separable diastereoisomers. In this one-pot multicomponent process, one C-N, one C-O and three C-C bonds are formed with concomitant creation of five asymmetric centers and three rings. Fragmentation of epoxy-tetrahydronaphthyridine 4 affords differentially substituted 5,6,7,8-tetrahydro-1,7-naphthyridine (5, 6) depending on the reaction conditions, providing thus additional structural diversity. A one-pot three-component synthesis of 5,6,7,8-tetrahydro-1,7-'naphthyridine (6) from 7, 8 and 9 is also documented. (c) 2005 Elsevier Ltd. All rights reserved.