The introduction of an oxygen atom substituent into the α-position of oxygen ester made it possible to generate corresponding boron enolates by the use of dialkylbouyl trifluoromethanesulfonate. These novel boron enolates of oxygen ester proceeded aldol reaction with various aldehydes in high yield and with excellent syn diastereoselectivity to provide glyceric acid derivatives.
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Sugano et al. (1989) studied this question.