Allylic C-H acetoxylation with a 4,5-diazafluorenone-ligated palladium catalyst: a ligand-based strategy to achieve aerobic catalytic turnover.
Allylic C-H acetoxylation with a 4,5-diazafluorenone-ligated palladium catalyst: a ligand-based strategy to achieve aerobic catalytic turnover.
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DOI:
10.1021/ja105829t
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发表时间:
2010-11-03
影响因子:
15
通讯作者:
Stahl SS
中科院分区:
文献类型:
--
作者:
Campbell AN;White PB;Guzei IA;Stahl SS
Pd-catalyzed C–H oxidation reactions often require the use of oxidants other than O2. Here, we demonstrate a ligand-based strategy to replace benzoquinone with O2 as the stoichiometric oxidant in Pd-catalyzed allylic C–H acetoxylation. Use of 4,5-diazafluorenone (1) as an ancillary ligand for Pd(OAc)2 enables terminal alkenes to be converted to linear allylic acetoxylation products in good yields and selectivity under 1 atm O2. Mechanistic studies reveal that 1 facilitates C–O reductive elimination from a π-allyl-PdII intermediate, thereby eliminating the requirement for benzoquinone in this key catalytic step.
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