The proper introduction and removal of protecting groups is one of the most important and widely carried out synthetic transformations in preparative organic chemistry. In particular, in the highly selective construction of complex, polyfunctional molecules, e.g., oligonucleotides, oligosaccharides, peptides, and conjugates thereof, and in the synthesis of alkaloids, macrolides, polyether antib...

Functional group incompatibility in the synthesis of complex organic molecules has been a problem since the infancy of organic chemistry. Emil Fischer made a valuable contribution to organic chemistry when he came up with the notion that an otherwise reactive functional group could be temporarily rendered inert by attaching a suitable protecting group that could then later be removed [1]. Today...

nano-silica supported boron trifluoride (bf3.sio2) is an efficient, reusable and eco-friendly catalyst for chemoselective thioacetalization of aldehydes and ketones. so, this catalyst was applied for transthioacetalization of acetals and acylals into their corresponding 1,3-dithiolanes or 1,3-dithianes  in good to excellent yields. the reactions were carried out at room temperature under solven...