enantioselective ring-opening desymmetrization of meso-aziridines with isocyanides was achieved in the presence of a chiral N,N′-dioxide/Mg(OTf)2 complex. The in situ generated chiral 1,4-zwitterionic intermediates were successfully trapped by intramolecular oxygen- and carbon-based nucleophiles or exogenous H2O and TMSN3, enabling a collective synthesis of various chiral vicinal amino-oxazoles, spiroindolines,
Synthesis of α-Isocyano-α-alkyl(aryl)acetamides and their Use in the Multicomponent Synthesis of 5-Aminooxazole, Pyrrolo[3,4-<i>b</i>]pyridin-5-one and 4,5,6,7-Tetrahydrofuro[2,3-<i>c</i>]pyridine
α-Isocyano-β-phenylpropionamide 1 is synthesized from the corresponding amino acid in excellent yield. The unique reactivity of this bifunctional compound is exploited for the development of novel multicomponent synthesis of 5-aminooxazole 6, pyrrolo[3,4-b]pyridin-5-one 10 and 4,5,6,7-tetrahydrofuro[2,3-c]pyridine 13.
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.
TAKIGUCHI, KAZUO;YAMADA, KUNIHIKO;SUZUKI, MAMORU;NUNAMI, KEN-ICHI;HAYASHI+, AGR. AND BIOL. CHEM., 53,(1989) N, C. 77-82