Heterocycles
N-, O- and S-heterocycles used as scaffold cores rather than as substituents. Most entries carry a carboxylic acid or an ester on the ring, which is the handle for the next step; several are brominated or chlorinated at the position that couples. Pyrazoles, triazoles, isoxazoles, oxadiazoles, pyridines, pyrimidines and saturated heterocycles are all represented. Late-stage work on these entries happens on the ring carbon or on the acid, which is why residual metal content matters more than the headline assay.
Heterocycles outside the catalogue
If the compound you need is not in this group but belongs to it chemically, send the structure. Most of what we make is not on the site: the catalogue is the part that is already characterised and packed.
A route review costs nothing and usually comes back within two working days with the step count and the likely purification burden.
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Group: Heterocycles