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Synthesis and fungicidal activity against Pyricularia oryzae of some heteroaryl thiophene carbamates

✍ Scribed by Mellor, Michael; Mitchell, Dale R; Osbourn, Susan E; Riordan, Peter D

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 124 KB
Volume: 55
Category: Article
ISSN: 1526-498X
DOI: 10.1002/(sici)1096-9063(199903)55:3<326::aid-ps915>3.0.co;2-f

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✦ Synopsis

A series of novel 3-(5-cyanopentylcarbamoyloxy)-5-(heteroaryl)-thiophene-2-carboxylic acid ester and amide derivatives has been synthesised and tested for fungicidal activity against the rice blast pathogen Pyricularia oryzae. The highest levels of fungicidal activity were observed when the heteroaryl group comprised either a 2-pyridyl or 2-pyrazinyl group. Ester derivatives proved to be more active than amides, the highest activity being associated with esters derived from and C 6 C 7 alcohols.

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A series of novel 6-(1,2,4-triazol-4-yl) chromone and -1-thiochromone (benzo [b]thiazin-4-one) derivatives was obtained by cyclisation via thiosemicarbazides which were prepared by reaction of hydrazines and the corresponding isothiocyanates. Their fungicidal activity was evaluated against the rice