Synthesis of Cyclopentenones via Intramolecular HWE and the Palladium-Catalyzed Reactions of Allylic Hydroxy Phosphonate Derivatives
作者:Bingli Yan、Christopher D. Spilling
DOI:10.1021/jo8004028
日期:2008.7.1
Palladium-catalyzed decarboxylative rearrangement of nonracemic phosphono allylic acetoacetates, or the intermolecular allylic substitution of nonracemic phosphono allylic carbonates with tert-butyl acetoacetate followed by hydrolysis and decarboxylation, gave ω-ketovinyl phosphonates. A highly regioselective Wacker oxidation gave the ω,β-diketophosphonates which underwent intramolecular HWE reaction
Substituent controlled reactivity switch: selective synthesis of α-diazoalkylphosphonates or vinylphosphonates via nucleophilic substitution of alkyl bromides with Bestmann–Ohira reagent
作者:Mukund M. D. Pramanik、Atul Kumar Chaturvedi、Namrata Rastogi
DOI:10.1039/c4cc05684a
日期:——
We report a substituent controlled nucleophilic displacement of alkyl bromides with Bestmann–Ohira reagent yielding either dimethyl diazoalkylphosphonates or (E)-vinylphosphonates.
Heck–Mizoroki coupling of vinyliodide and applications in the synthesis of dienes and trienes
作者:Katrina S. Madden、Sylvain David、Jonathan P. Knowles、Andrew Whiting
DOI:10.1039/c5cc03273c
日期:——
Vinyliodide reacts chemoselectively under Heck-Mizoroki conditions with terminal alkenes, including vinylboronate esters, to give dienes. The resulting dienylboronates undergo Suzuki-Miyaura coupling with aryl, heteroaryl and alkenyl halides to access dienes...