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H2O,/HOAc

Four Milk, ACN/Na2CO3 extn. 15 Silica gel BUOH/H2O/HOAC Vis/Xanthydrol or 20 ppb/ 143... [Pg.933]

KMn04, H2O, HOAc, CH2CI2, phase transfer agent... [Pg.1220]

The TES group is the most labile of the common silyl protecting groups, apart from TMS, and can usually be removed in the presence of TBS, triisopropylsilyl (TIPS) and rerf-butyldiphenylsijyl (TBDPS) groups. Selective deprotection of a TES ether using aqueous trifluoroaoetic acid left two TBS ethers and two TIPS ethers intact in the Merck synthesis of the immunosuppressant FK-506 [Scheme 4.19].22 Weaker acids such as H2O-HOAC-THF (3 5 11) at room temperature,33 HF pyridine24 and pyridinium p-toluenesulfonate [Scheme 4.2Q]23 can accomplish similar transformations. [Pg.203]

See other pages where H2O,/HOAc is mentioned: [Pg.7]    [Pg.238]    [Pg.1109]    [Pg.639]    [Pg.1986]    [Pg.8]    [Pg.71]    [Pg.259]    [Pg.27]    [Pg.418]    [Pg.469]    [Pg.362]    [Pg.59]    [Pg.210]    [Pg.389]    [Pg.380]    [Pg.1201]    [Pg.1256]    [Pg.522]    [Pg.523]    [Pg.650]    [Pg.1015]    [Pg.1650]    [Pg.1965]    [Pg.2159]    [Pg.2307]    [Pg.521]    [Pg.1099]    [Pg.230]    [Pg.232]    [Pg.419]    [Pg.143]    [Pg.461]    [Pg.470]    [Pg.424]    [Pg.100]    [Pg.92]    [Pg.92]    [Pg.35]    [Pg.54]    [Pg.317]    [Pg.100]    [Pg.1049]    [Pg.213]   
See also in sourсe #XX -- [ Pg.627 ]



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