Triple play: The title reaction of 1 with simple aldehydes gives 3,5,7-trisilyloxy aldehydes in high yields and diastereoselectivities with extremely low catalyst loading (see scheme). Iodobenzene facilitates the third aldol reaction by apparently acting as a Lewis base towards the silyl catalyst. Tf=trifluoromethanesulfonyl.
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Albert et al. (2010) studied this question.
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