Sulfur based pharmaceutical intermediates refer to a class of compounds containing sulfur atoms, which can serve as important structural units or reactive parts of drug molecules. Sulfur intermediates have a wide range of applications in the pharmaceutical field, serving as intermediates, raw materials, or pharmacophores for the synthesis of drugs.

Some common sulfur based pharmaceutical intermediates include:

Thiols: Compounds containing sulfur hydrogen bonds, such as mercaptomethane (CH3SH).
Thioethers: Compounds containing sulfur carbon bonds, such as ethylthioethers (C2H5-S-C2H5).
Thiophenols: Aromatic compounds containing sulfur atoms, such as thiophenol (C6H5SH).
Thioaldehyde: Compounds containing sulfur atoms and aldehyde groups, such as formaldehyde (CH3-CHO).
Thiones: Compounds containing sulfur atoms and ketone groups, such as thioethanone (CH3-CO-SCH3).
Thioamides: Compounds containing acyl amino groups substituted with sulfur atoms, such as thioacetamide (CH3C (S) NH2).

These sulfur based pharmaceutical intermediates play an important role in drug synthesis and efficacy research, for example, thiols and thioethers are commonly used to synthesize biologically active molecules and drugs; Thiophenol compounds are commonly found in antioxidants and drugs; Thiamine compounds play a certain role in drug metabolism pathways.