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The Kobayashi aldol reaction is one of the most powerful methods to synthesize the polyketide skeleton and has been applied to the total synthesis of natural products. This methodology has been used to construct anti-aldol products, and only a few precedents on the syn-selective Kobayashi aldol reaction are known. A syn-selective Kobayashi aldol reaction by using the E,E-vinylketene silyl N,O-acetal and an excess amount of Lewis acid is presented.

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