cialis from india Exemplary oxygen protecting groups include, but are not limited to, methyl, t butyloxycarbonyl BOC or Boc, methoxylmethyl MOM, methylthiomethyl MTM, t butylthiomethyl, phenyldimethylsilyl methoxymethyl SMOM, benzyloxymethyl BOM, p methoxybenzyloxymethyl PMBM, 4 methoxyphenoxy methyl p AOM, guaiacolmethyl GUM, t butoxymethyl, 4 pentenyloxymethyl POM, siloxymethyl, 2 methoxyethoxymethyl MEM, 2, 2, 2 trichloroethoxymethyl, bis 2 chloroethoxy methyl, 2 trimethylsilyl ethoxymethyl SEMOR, tetrahydropyranyl THP, 3 bromotetrahydropyranyl, tetrahydrothiopyranyl, 1 methoxycyclohexyl, 4 methoxytetrahydropyranyl MTHP, 4 methoxytetrahydrothiopyranyl, 4 methoxytetrahydrothiopyranyl S, S dioxide, 1 2 chloro 4 methyl phenyl 4 methoxypiperidin 4 yl CTMP, 1, 4 dioxan 2 yl, tetrahydrofuranyl, tetrahydrothiofuranyl, 2, 3, 3a, 4, 5, 6, 7, 7a octahydro 7, 8, 8 trimethyl 4, 7 methanobenzofuran 2 yl, 1 ethoxyethyl, 1 2 chloroethoxy ethyl, 1 methyl 1 methoxy ethyl, 1 methyl 1 benzyloxyethyl, 1 methy 1 1 benzyloxy 2 fluoroethy 1, 2, 2, 2 trichloroethyl, 2 trimethylsilylethyl, 2 phenylselenyl ethyl, t butyl, allyl, p chlorophenyl, p methoxyphenyl, 2, 4 dinitrophenyl, benzyl Bn, p methoxybenzyl, 3, 4 dimethoxybenzyl, o nitrobenzyl, p nitrobenzyl, p halobenzyl, 2, 6 dichlorobenzyl, p cyanobenzyl, p phenylbenzyl, 2 picolyl, 4 picolyl, 3 methyl 2 picolyl N oxido, diphenylmethyl, p, p dinitrobenzhydryl, 5 dibenzosuberyl, triphenylmethyl, О± naphthyldiphenylmethyl, p methoxyphenyldiphenylmethyl, di p methoxyphenyl phenylmethyl, tri p methoxyphenyl methyl, 4 4 bromophenacyloxyphenyl diphenylmethyl, 4, 4, 4 tris 4, 5 dichlorophthalimidophenyl methyl, 4, 4, 4 tris levulinoyloxyphenyl methyl, 4, 4, 4 tris benzoyloxyphenyl methyl, 3 imidazol 1 yl bis 4, 4 dimethoxyphenyl methyl, 1, 1 bis 4 methoxyphenyl 1 pyrenylmethyl, 9 anthryl, 9 9 phenyl xanthenyl, 9 9 phenyl 10 oxo anthryl, 1, 3 benzodisulfuran 2 yl, benzisothiazolyl S, S dioxido, trimethylsilyl TMS, triethylsilyl TES, triisopropylsilyl TIPS, dimethylisopropylsilyl IPDMS, diethylisopropylsilyl DEIPS, dimethylthexylsilyl, t butyldimethylsilyl TBDMS, t butyldiphenylsilyl TBDPS, tribenzylsilyl, tri p xylylsilyl, triphenylsilyl, diphenylmethylsilyl DPMS, t butylmethoxyphenylsilyl TBMPS, formate, benzoylformate, acetate, chloroacetate, dichloroacetate, trichloroacetate, trifluoroacetate, methoxyacetate, triphenylmethoxyacetate, phenoxyacetate, p chlorophenoxyacetate, 3 phenylpropionate, 4 oxopentanoate levulinate, 4, 4 ethylenedithio pentanoate levulinoyldithioacetal, pivaloate, adamantoate, crotonate, 4 methoxycrotonate, benzoate, p phenylbenzoate, 2, 4, 6 trimethylbenzoate mesitoate, alkyl methyl carbonate, 9 fluorenylmethyl carbonate Fmoc, alkyl ethyl carbonate, alkyl 2, 2, 2 trichloroethyl carbonate Troc, 2 trimethylsilyl ethyl carbonate TMSEC, 2 phenylsulfonyl ethyl carbonate Psec, 2 triphenylphosphonio ethyl carbonate Peoc, alkyl isobutyl carbonate, alkyl vinyl carbonate alkyl allyl carbonate, alkyl p nitrophenyl carbonate, alkyl benzyl carbonate, alkyl p methoxybenzyl carbonate, alkyl 3, 4 dimethoxybenzyl carbonate, alkyl o nitrobenzyl carbonate, alkyl p nitrobenzyl carbonate, alkyl 5 benzyl thiocarbonate, 4 ethoxy 1 napththyl carbonate, methyl dithiocarbonate, 2 iodobenzoate, 4 azidobutyrate, 4 nitro 4 methylpentanoate, o dibromomethyl benzoate, 2 formylbenzenesulfonate, 2 methylthiomethoxy ethyl, 4 methylthiomethoxy butyrate, 2 methylthiomethoxymethyl benzoate, 2, 6 dichloro 4 methylphenoxyacetate, 2, 6 dichloro 4 1, 1, 3, 3 tetramethylbutyl phenoxyacetate, 2, 4 bis 1, l dimethylpropyl phenoxyacetate, chlorodiphenylacetate, isobutyrate, monosuccinoate, E 2 methyl 2 butenoate, o methoxyacyl benzoate, О± naphthoate, nitrate, alkyl N, N, N, N tetramethylphosphorodiamidate, alkyl N phenylcarbamate, borate, dimethylphosphinothioyl, alkyl 2, 4 dinitrophenylsulfenate, sulfate, methanesulfonate mesylate, benzylsulfonate, and tosylate Ts
