Synthesis p. 278 - 280 (1988)
Update date:2022-08-03
Topics:
Hiratake, Jun
Shibata, Kayoko
Baba, Naomichi
Oda, Jun'ichi
2,2-Dimethyl-5-methyl-5-phenyl-4,6-dioxo-1,3-dioxane (1) was cleaved asymmetrically, by nucleophilic attack of primary alkoxide ions, paired with N-benzylquaternary ammonium cations, derived from cinchona alkaloids, to give optically active monoalkyl malonates 3 with moderate stereoselectivity.The ester group of 3 was selectively reduced to afford optically active α-methyltropic acid (5) in good yield.The relationship between the structure of ammonium cations and the direction of stereoselectivity is described.
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