NIPPON KAGAKU KAISHI
Online ISSN : 2185-0925
Print ISSN : 0369-4577
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Regioselective Aldol Addition Reaction of Nitroalkane Dianions
Seiji TANAKAKazunori KAWASAKIMariko HIRAOKeiki KISHIKAWAShigeo KOHMOTOMakoto YAMAMOTO
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2002 Volume 2002 Issue 3 Pages 475-479

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Abstract

Previously we reported regioselective formation of dianions derived from liner nitroalkanes in the presence of n-BuLi and HMPA. The formation of nitroalkane dianions either α,α- or α,β-dianions depended on the order of addition of reagents.
However, the usage of a carcinogen suspected compound like HMPA is undesirable. Therefore we re-investigated the new combination of bases and aprotic dipolar solvents other than HMPA.
After exploration of a variety of their combination, it was found that the combination of LDA and DMPU resulted in the formation of α,β-dianion with the best regioselectivity; the ratio of α- to β-adduct was 1 to 14 in the reaction of nitroethane with benzaldehyde.

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© 2002 The Chemical Society of Japan
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