How does 2,2-dimethoxypropane function in the final step of the synthesis of 2-deoxy-2-amino-C-glycoside?

Label:chem

Topic
A study describes the use of 2,2-dimethoxypropane in the acetonide protection of the resulting diol.
Answer
2,2-Dimethoxypropane is used to protect the diol group in the final step of the synthesis. It reacts with the diol in the presence of a catalytic amount of para-toluenesulfonic acid (PTSA) to form an acetonide, which protects the diol functionality and stabilizes the final product.
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