114012-42-9Relevant articles and documents
Preparation method and application of 3-(substituted phenyl) oxetane-3-carboxylic acid and intermediate thereof
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Paragraph 0065-0066; 0077-0078, (2020/11/12)
The preparation method comprises the following steps: taking 3-oxetanone (compound II) as an initial raw material, and carrying out Wittig reaction on the initial raw material and triethyl phosphonotriacetate under an alkaline condition to obtain a compound III; carrying out coupling reaction on the compound III and a boric acid compound IV to obtain a compound V; reducing the ester group of the compound V to generate a compound VI; carrying out nucleophilic substitution reaction on hydroxyl of the compound VI and sulfonyl chloride/sulfonic anhydride to generate a compound VII; reacting hydroxyl of the compound VI with a halogenating reagent to generate a compound VIII; carrying out elimination reaction on the compound VII or the compound VIII to generate a compound IX; and finally, oxidizing the double bonds of the compound IX to generate 3-(substituted phenyl) oxetane-3-carboxylic acid (compound I). The method is easy and convenient to operate and high in yield, the total yield can reach 35%, and large-scale production can be achieved.
Process for the preparation of 2,2-bis-chloro-methylalkanecarboxylic acid chlorides
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, (2008/06/13)
A process for the preparation of a 2,2-bis-chloro-methyl-alkanecarboxylic acid of the formula STR1 in which R is hydrogen, alkyl, cycloalkyl or optionally substituted phenyl, which comprises reacting an oxetane-3-carboxylic acid of the formula STR2 or a salt thereof, with an inorganic acid chloride at a temperature between 20° C. and the boiling point of the reaction mixture. The products are known intermediates for fungicides and herbicides.