期刊
ORGANIC LETTERS
卷 23, 期 18, 页码 7044-7048出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c02406
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The allylic C-H acyloxylation of terminal alkenes with 4-nitrobenzoic acid was efficiently assisted by a bidentate-sulfoxide-ligated palladium catalyst combined with 1,4-benzoquinone and Ag2CO3 under mild reaction conditions. The catalytic system exhibited high branch selectivity and a wide substrate scope, leading to the synthesis of a useful intermediate for (R)-alpha-lipoic acid.
An allylic C-H acyloxylation of terminal alkenes with 4-nitrobenzoic acid was assisted by a bidentate-sulfoxide-ligated palladium catalyst combined with 1,4-benzoquinone and Ag2CO3 under mild reaction conditions. The catalytic activity was remarkably enhanced by Ag2CO3 as an additive and 4-nitrobenzoic acid as a carboxylate source; both components were essential to exhibiting high catalytic activity, high branch selectivity, and a wide substrate scope with low loading of the palladium catalyst. Branch-selective allylic acyloxylation of ethyl 7-octenoate (1a) gave the product which was led to ethyl 6,8-dihydroxyoctanoate (5), a useful synthetic intermediate of (R)-alpha-lipoic acid.
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