title: Synthesis, fungicidal activity, and structure-activity relationship of spiro-compounds containing macrolactam (macrolactone) and thiadiazoline rings.
abstract: Two series of novel spiro-compounds containing macrolactam or macrolactone and thiadiazoline rings, 1-thia-2-alkylimino-3,4,9-triaza-10-oxospiro[4.15]eicosyl-3-ene (4F) and 1-thia-2-alkylimino-3,4-diaza-9-oxa-10-oxospiro[4.15]eicosyl-3-ene (4G), were synthesized from 12-oxo-1,15-pentadecanlactam and 12-oxo-1,15-pentadecanlactone, respectively. Their structures were confirmed by elemental analysis, (1)H NMR, and (13)C NMR. The conformation of compounds 4F was determined via the crystal structure of a representative compound (4F(6)). The bioassay showed that compounds 4F have much better fungicidal activity against five fungi ( Botrytis cinerea Pers., Sclerotinia sclerotiorum , Rhizoctonia solani Kuhn., Phomopsis asparagi Sacc., and Pyricularia oryzae Cav.) than compounds 4G. The fact above showed that the presence of a hydrogen-bonding donor for the fungicidal activity of macrocyclic compounds is very important. 4F(6) showed excellent fungicidal activity against P. oryzae, which is much better than the commercial fungicide isoprothiolane, and 4F(13) showed excellent fungicidal activity against P. oryzae and good fungicidal activity against P. asparagi.
authors.affiliation: Key Laboratory of Pesticide Chemistry and Application Technology, Department of Applied Chemistry, China Agricultural University, Beijing, People's Republic of China 100193.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Li
authors.forename: Xiao-Mei
authors.initials: XM
authors.lastname: Liang
authors.forename: Shu-Hui
authors.initials: SH
authors.lastname: Jin
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Zhang
authors.forename: Hui-Zhu
authors.initials: HZ
authors.lastname: Yuan
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Qi
authors.forename: Fu-Heng
authors.initials: FH
authors.lastname: Chen
authors.forename: Dao-Quan
authors.initials: DQ
authors.lastname: Wang
mesh_terms: D005658:Fungi / Q000187:drug effects; D005659:Fungicides, Industrial / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D006860:Hydrogen Bonding; D007769:Lactams / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013329:Structure-Activity Relationship; D013830:Thiadiazoles / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D005659:Fungicides, Industrial; D007769:Lactams; D013830:Thiadiazoles