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Silyl Enol Ether Usable for Highly Stereoselective Aldol Reactions
No.172(January 2017)
Isopropenyloxytris(trimethylsilyl)silane (1) is a silyl enol ether substituted with three trimethylsilyl groups on a silicon atom. The tris(trimethylsilyl)silyl (TTMSS) group having a characteristic sterically hindered structure is called “super silyl group” and it contributes to highly diastereoselective synthetic reactions. For example, when 1 is treated with 2-phenylpropanal in the presence of an acid catalyst, the reaction proceeds to obtain the adduct 2 as a nearly single diastereomer. Following treatment with phenyl magnesium bromide affords the three-component adduct 3 with high anti-selectivity.1)

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