All articles of this category The lithiated SAMP-hydrazone ( S )- 3 [( S )-1-(2,2-dimethyl-1, 3-dioxan-5-ylideneamino)-2-methoxymethylpyrrolidine] is used as a chiral 1,3-dihydroxyacetone-enolate equivalent C in overall enantioselective α-alkylations leading to 4-alkyl-2,2-dimethyl-1,3-dioxan-5-ones ( S )- 5a-i in good overall chemical yields and of high enantiomeric purity (ee = 88 - ≧ 93%.
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Enders et al. (1989) studied this question.