prov:value
| - nzyl) can be cleaved optionally selectively (e.g., by hydrolysis) in the presence of R.sup.5 protective groups(e.g., t-butyl).If Z.sup.1 stands for an acid protective group, the reaction is carried out preferably is solvents such as methylene chloride, dimethylformamide, acetonitrile, tetrahydrofuran, dioxane, chloroform, lower alcohols such as methanol, ethanol andisopropanol, as well as mixtures
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