Continuous Flow Generation of Acylketene Intermediates via Nitrogen Extrusion
作者:Harry R. Smallman、Guilherme A. Brancaglion、Julio C. Pastre、Duncan L. Browne
DOI:10.1021/acs.joc.2c01486
日期:2022.9.16
of acylketene precursors through extrusion of nitrogen gas is reported. Key to the development of a suitable continuous protocol is the balance of reaction concentration against pressure in the flow reactor. The resulting process enables access to intercepted acylketene scaffolds using volatile amine nucleophiles and has been demonstrated on the gram scale. Thermal gravimetric analysis was used to
Microwave-Assisted Domino and Multicomponent Reactions with Cyclic Acylketenes: Expeditious Syntheses of Oxazinones and Oxazindiones
作者:Marc Presset、Yoann Coquerel、Jean Rodriguez
DOI:10.1021/ol9024056
日期:2009.12.17
The microwave-assisted Wolff rearrangement of cyclic 2-diazo-1,3-diketones In the presence of aldehydes and primary amines provides a straightforward access to functionalized bi- and pentacyclic oxazinones following an unprecedented three-component domino reaction. Alternatively, in the presence of acyl azides, an efficient Curtius/Wolff/hetero-Diels-Alder sequence allows the direct synthesis of oxazindiones.
CAPUANO L.; KIRN H. R.; ZANDER R., CHEM. BER. <CHBE-AM>, 1976, 109, NO 7, 2456-2461