Addition of magnesium anion 4 (M = MgBr, R-1 = TES) to ketone 6 (R-2 = PMB) at -78 degreesC in THF proceeded under chelation control to provide alcohol 7, which possesses the full set of the chiral centers of fostriecin. Subsequently, 7 was transformed successfully to the known key intermediate 2.
Addition of magnesium anion 4 (M = MgBr, R-1 = TES) to ketone 6 (R-2 = PMB) at -78 degreesC in THF proceeded under chelation control to provide alcohol 7, which possesses the full set of the chiral centers of fostriecin. Subsequently, 7 was transformed successfully to the known key intermediate 2.
Addition of magnesium anion 4 (M = MgBr, R-1 = TES) to ketone 6 (R-2 = PMB) at -78 degreesC in THF proceeded under chelation control to provide alcohol 7, which possesses the full set of the chiral centers of fostriecin. Subsequently, 7 was transformed successfully to the known key intermediate 2.