Reductive Cross-Aldol Reaction Using Bromoaldehyde and an Aldehyde Mediated by Germanium(II): One-Pot, Large-Scale Protocol
Makoto Yasuda, Shin-ya Tanaka and Akio Baba*
*Department of Molecular Chemistry and Handai Frontier Research Center, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, Email: yasudachem.eng.osaka-u.ac.jp
M. Yusada, S.-Y. Tanaka, A. Baba, Org. Lett., 2005, 7, 1845-1848.
DOI: 10.1021/ol050533i (free Supporting Information)
The reaction of α-bromoaldehydes with aldehydes in the presence of GeCl2-dioxane gave cross-aldol equivalents with syn-selectivity. The initially formed β-germoxyaldehydes did not lead to side products. Addition of a catalytic amount of Bu4NBr improved the yield and selectivity.
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Reductive Cross Aldol Reactions, β-Hydroxy Ketones