Oxazosulfyl

Uses

Oxazosulfyl is a potent agricultural fungicide. Oxazosulfyl can be used as an insecticide against major rice pests[1].

Production Methods

Oxazosulfyl is produced through an industrial route that assembles its oxadiazolone core and heavily substituted aryl-sulfonyl side chain using a modular strategy designed to control sulphur-based impurities and halogenated by-products. Commercial syntheses typically begin with construction of the 1,3,4-oxadiazol-2-one ring from an appropriate hydrazide or acylhydrazine precursor, followed by cyclisation under dehydrating conditions to establish the heterocycle. In parallel, the fluorinated aryl-sulfonyl fragment is prepared through controlled halogenation and sulfonylation steps, then converted into a reactive sulfonyl chloride or equivalent. The key assembly stage is the coupling of this activated sulfonyl intermediate with the oxadiazolone nucleus under anhydrous, base-mediated conditions that suppress over-sulfonylation and decomposition of the heterocycle.

Mechanism of action

Broad-spectrum control. Works by inhibiting the vesicular acetylcholine transporter (VAChT) which reduces cholinergic synaptic transmission, leading to paralysis and death in target insects

References

[1] Rosemary Lees, et al. A Testing Cascade to Identify Repurposed Insecticides for Next-Generation Vector Control Tools: Screening a Panel of Chemistries With Novel Modes of Action Against a Malaria Vector. Gates Open Res.2019 Jul 10;3:1464. DOI:10.12688/gatesopenres.12957.2

Pesticide Type

Insecticide; Fungicide