期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 12, 页码 4556-4562出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c02084
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资金
- National Natural Science Foundation of China [21871287, 21922114]
- Science and Technology Commission of Shanghai Municipality [20JC1417100]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances
- Shanghai Institute of Organic Chemistry
The study demonstrates a regioselective asymmetric allylation of ketones using commercially available 1,4-pentadiene as a pronucleophile. Chiral tertiary alcohols with a terminal (Z)-1,3-diene unit are produced with high (Z)/(E) ratio and enantioselectivity. The partial isomerization of (E)-allylcopper(I) species to (Z)-allylcopper(I) species is observed during the reaction.
By using commercially available 1,4-pentadiene as a pronucleophile, a copper(I)-catalyzed regioselective asymmetric allylation of ketones is achieved. A variety of chiral tertiary alcohols bearing a terminal (Z)-1,3-diene unit are generated in high (Z)/(E) ratio and high enantioselectivity. Both aromatic ketones and aliphatic ketones serve as suitable substrates. Furthermore, the reactions with (E)-C-1(alkyl)-1,4-dienes proceed in moderate yields with acceptable enantioselectivity but with low (Z,E)/others ratio, which demonstrates the partial isomerization of (E)-allylcopper(I) species to (Z)-allylcopper(I) species through 1,3-migration. Subsequent Heck reaction and olefin metathesis compensate for the low efficiency with C-1-1,4-dienes. The synthetic utility of the product is further demonstrated by a copper(I)-catalyzed regioselective borylation of the 1,3-diene group.
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