Glycolic Acid → (Vinyl-2-ylidenetris(oxy))tris(trimethylsilane)

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Reaction Steps

The reagent 1,1,2-tris-trimethylsilyloxyethylene (80) and its use for the conversion of acid chlorides to hydroxyketone (for example 96 to 98 and 90 to 92) are claimed in this invention. The reagent preparation is described hereinbelow in Flowsheet M. The reaction of glycolic acid with 1,1,1,3,3,3-hexamethyldisilazane and trimethylsilylchoride in pyridine gives bis-trimethylsilated glycolic acid (113). Addition of (113) to a tetrahydrofuran solution of one equivalent of lithium 1,1,1,3,3,3-hexamethyldisilazane amide at -78° C. generates a lithium enolate which is trapped with trimethylsilylchloride to produce the desired reagent (80). ##STR97##

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