Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 73, Issue 11, Pages 4017-4026Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo800204n
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Funding
- NCRR NIH HHS [NC P20 RR 016470, P20 RR016470] Funding Source: Medline
- NIGMS NIH HHS [S06 GM008216, S06 GM008216-250004, GM 08216] Funding Source: Medline
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An asymmetric synthesis for the preparation of nonracemic amines bearing heterocyclic and heteroaromatic rings is described. A variety of important enantiopure thionyl and arylalkyl primary amines were afforded by the borane-mediated enantioselective reduction of O-benzyl ketoximes using 10% of catalyst 10 derived from (S)-diphenylvalinol and ethylene glycol with excellent enantioselectivity, in up to 99% ce. The optimal condition for the first asymmetric reduction of 3- and 4-pyridyl-derived O-benzyl ketoxime ethers was achieved using 30% of catalytic loading in dioxane at 10 degrees C. (S)-N-ethylnornicotine (3) was also successfully synthesized from the TIPS-protected (S)-2-arnino-2-pyridylethanol in 97% ee.
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