Abstract
Grignard reagents, especially isopropylmagnesium chloride, smoothly undergo Michael addition onto methyl 2-bromo- and 2-chloro-2-cyclopropylideneacetate (1 -Cl), and the thus formed magnesium enolates are particularly efficiently trapped with aromatic aldehydes. This one-pot reaction provides highly substituted chlorohydrines, mostly in high yields (10 out of 18 examples with 72-92%) and as pure (2S *,3R *)-diastereomers (anti -aldols). These chlorohydrines can be transformed to Darzens-type α,β-epoxyesters in good yields, as demonstrated for one example.
Key words
small ring systems - Michael additions - aldol reactions - domino reactions - diastereoselectivity - synthetic methods
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