Radiosynthesis of a chloroacetanilide herbicide ([phenyl-4-3H] acetochlor) and a dichloroacetamide safener for herbicides ([2, 2-dimethyl-3H]R-29148)
作者:Bachir Latli、John E. Casida
DOI:10.1002/jlcr.2580360207
日期:1995.2
2-Chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamide (the chloroacetanilide herbicide acetochlor) and 3-(dichloroacetyl)- 2,2,5-trimethyl-1,3-oxazolidine (the dichloroacetamide safener R- 29148) are required at high specific activity for studies on their metabolism and mode of action. [phenyl-4-3H]Acetochlor was obtained at 22 Ci/mmol in 71% yield by reductive dehalogenation of iodoacetochlor with tritium gas in ethanol in the presence of palladium on carbon and triethylamine. [2,2-dimethyl-3H]R-29148 was prepared at 15 Ci/mmol by treating acetone and 1-amino-2-propanol in pentane with two equivalents of NaOH in tritiated water (i.e. hydroxide ion-catalyzed enolization of acetone) followed by dichloroacetyl chloride.