Ketoximes to N-substituted thioamides via PSCl3 mediated Beckmann rearrangement
作者:Uma Pathak、Lokesh Kumar Pandey、Sweta Mathur、M. V. S. Suryanarayana
DOI:10.1039/b911844f
日期:——
N-Substituted thioamides were accessed from ketoximes by utilising PSCl3 as a uniquely capable reagent to induce Beckmannrearrangement as well as to capture the intermediate nitrilium ion.
Sulfonamide derivatives of the formula
wherein
Q is an optionally substituted benzothiazole, benzi- sothiazole, benzoxazole or benzisoxazole group;
W, is 0 or S.
R7 is H or CH3; and
A is a mono- or bicyclic heterocyclic group, e.g. pyrimidinyl or triazinyl.
and their agriculturally suitable salts, exhibit herbicidal activity. Some also show a plant growth regulant effect.
The compounds may be formulated for agricultural use in conventional manner. They may be made e.g. by reacting an appropriate sulfonyl isocyanate or isothiocyanate QSO2NCW1 with an appropriate heterocylic amine HNR7A.
式中的磺酰胺衍生物
其中
Q 是任选取代的苯并噻唑、苯并噻唑、苯并噁唑或苯并异噁唑基团;
W 是 0 或 S
R7 是 H 或 CH3;以及
A 是单环或双环杂环基团,如嘧啶基或三嗪基。
这些化合物及其农业上适用的盐类具有除草活性。有些化合物还具有植物生长调节作用。
这些化合物可按常规方法配制成农用制剂。例如,可将适当的磺酰异氰酸酯或异硫氰酸酯 QSO2NCW1 与适当的杂环胺 HNR7A 反应制成。
Studies on organophosphorus compounds XXI. the dimer of p-methoxyphenylthionophosphine sulfide as thiation reagent. a new route to thiocarboxamides
作者:S. Scheibye、B. S. Pedersen、S.-O. Lawesson
DOI:10.1002/bscb.19780870311
日期:——
AbstractThe thiation properties of the dimer of p‐methoxyphenylthionophosphine sulfide, 1, has been investigated by performing reactions with a representative series of aliphatic and aromatic primary, secondary, and tertiary carboxamides in the temperature range 80‐100 °C using HMPA as solvent. This new method seems to be superior to all others as in most cases quantitative yields are found. Salicylanilide, when reacted with 1, in HMPA, yields salicylthioanilide and a new type of phosphorus heterocycle, 3, whose structure has been determined by NMR‐and X‐ray analyses. 13C NMR data are tabulated for a series of thioamide carbons.
133. The associating effect of the hydrogen atom. Part XI. Hydrogen bonds involving the sulphur atom. The S–H–N bond