Cyclic Phosphine Oxides and Phosphinamides from Di-Grignard Reagents and Phosphonic Dichlorides: Modular Access to Annulated Phospholanes
作者:Aaron M. Gregson、Steven M. Wales、Stephen J. Bailey、Anthony C. Willis、Paul A. Keller
DOI:10.1021/acs.joc.5b01476
日期:2015.10.2
The reaction between 1,4-di-Grignard reagents and phosphonous(III) dichlorides is a classical method for the direct synthesis of phospholanes. Reported here is an extension of this approach to the preparation of value-added, annulated phospholane oxides, achieved through the combination of carbocyclic-fused di-Grignardreagents and readily available phosphonic(V) dichlorides. The procedure is amenable
A new synthesis of 3-substituted-1H-indenes through reaction of o-(β-magnesioalkyl)phenylmagnesium dihalides with carboxylate esters
作者:Robert W. Baker、Michael A. Foulkes、Michael Griggs、Bao N. Nguyen
DOI:10.1016/s0040-4039(02)02344-4
日期:2002.12
A new synthesis of 3-substituted-1H-indenes has been developed through the reaction of o-(β-magnesioalkyl)phenylmagnesium dihalides with carboxylate esters, followed by dehydration of the intermediate 1-substituted-1-indanols. Di-Grignard reagents allowing the synthesis of 3-substituted-, 2-methyl-3-substituted-, and 4-methyl-3-substituted-1H-indenes have been prepared, with overall yields for the
Arsenous chloride-free synthesis of cyclic tertiary organoarsines from arylarsine oxides and di-Grignard reagents
作者:Aaron M. Gregson、Steven M. Wales、Stephen J. Bailey、Paul A. Keller
DOI:10.1016/j.jorganchem.2015.03.006
日期:2015.6
sparked recent interest in new syntheticroutes to tertiary arsines that avoid hazardous arsenous chloride reagents. However, safer methods for the synthesis of lesser explored arsine heterocycles, especially those containing As–C(sp3) bonds, remain lacking. We demonstrate for the first time that bench stable, less hazardous, arylarsine(III) oxides are effective substitutes for their corresponding chlorides
Development of a Protocol for Eight- and Nine-Membered Ring Synthesis in the Annulation of sp<sup>2</sup>,sp<sup>3</sup>-Hybridized Organic Dihalides with Keto Esters
作者:Gary A. Molander、Christoph Köllner
DOI:10.1021/jo001195w
日期:2000.12.1
eight- and nine-membered carbocycles. In this process wherein one alkenyl- or arylbromide and a tethered alkyl chloride comprise the organic dihalide, a selective metal-halogen exchange reaction between the sp(2)-hybridized bromide and an organolithium initiates the process. Transmetalation to an organoytterbium reagent generates a species that undergoes selective carbonyl addition to the ketone of
A novel and efficient route to azabicycles via the isocyanate-mediated twofold cyclization
作者:Mingming Li、Ping Xing、Biao Jiang
DOI:10.1016/j.tet.2016.01.050
日期:2016.3
A new one-pot route to azabicycles involving the [3,3]-sigmatropicrearrangement of dehydration product from allylic alcohol carbamate and base promoted twofold cyclization was described.