4-Methoxybenzyl ether (PMB)

Protection :
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ReagentsTimeYield
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Sc(OTf)3 Cl3C(=NH)OCH2(p-MeOPh)2 h94 %Sc(OTf)3, Cl3C(=NH)OCH2(p-MeOPh)PhMe0 °C, 2 h, 94%
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TfOH Cl3C(=NH)OCH2(p-MeOPh)3 h75 %TfOH, Cl3C(=NH)OCH2(p-MeOPh)CH2Cl20 °C, 3 h, 75%"99 % yield based on 76 % conversion."
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Cl3C(=NH)OCH2(p-MeOPh) La(OTf)33 h90 %Cl3C(=NH)OCH2(p-MeOPh), La(OTf)3THFRT, 3 h, 90%