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d. Block D OCH3 1. HOCH2CH2OH cat. TsOH 2a. CH 3MgBr (2 eq), Et20 2b. aq NaHCO3 workup 3a. NaH, THF, 0 C 3b. BnBr,

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d. Block D OCH3 1. HOCH2CH2OH cat. TsOH 2a. CH 3MgBr (2 eq), Et20 2b. aq NaHCO3 workup 3a. NaH, THF, 0 C 3b. BnBr, cat. n-Bu4NI

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