Agrochemicals from Natural Products (Books in Soils, Plants, by C.R.A. Godfrey

By C.R.A. Godfrey

Deals a radical assessment of the $64000 agricultural functions of either ordinary items and artificial compounds derived from ordinary items, providing distinctive details at the isolation, structural experiences, organic job and toxicology of those compounds. The increasing sector of insecticidal average items is highlighted.

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Assimisin is a member of a class of bioadive compounds referred to as Annonaceous acetogenins the first of which, uvarian, an antileukemic compound, was reported only as recently as 1982 [194]. A review of the status of this group of compounds is provided by Rupprecht and co-workers [195]. As insecticides, asimisin along with annonin I (Figure 20) appear to have been the most thoroughly evaluated and to be the most broadly active of the acetogenins. Several others [193], including bullaticin [196], sylvatian [lW], neoannonin [198], annonin N [199], goniothalamicin [200], and annonaan [201] are reported to have some insecticidal properties.

0, and 12 pg/cm2 for neonate milkweed bugs (Oncopehs fasciatus), cutworms, and grasshoppers (Melanoplus sanguinip), respectively [184]. Demethylencecalin (91)was significantly less active in this comparison although, by topical application to neonate grasshoppers, the approximate LD, of 38 nmol/insed was about half that of encecalin. In this test, demethoxyencecalin (92) was equivalent to encecalin. A number of additional natural and synthesized chromenes were evaluated in the vial contact test [184].

V. UNSATURATED AMIDES A. Background In his 1971review [loo],Jacobson described a number of plant-derived unsaturated isobutylamides isolated from the families Compositae and Rutaceae, for example, pellitorine and affinin (49 and SO, Figure lo), and their insecticidal properties. As a group, they were characterized as pungent compounds which promote numbnessand salivation when tasted. In addition to work establishing methods for the synthesis ADDOR 22 SI Ppecidds 0 63 Quhreensine 54 Pipeline Figure 10 Insecticidal unsaturated amides.

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