Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 843666-40-0, Name is 18-(tert-Butoxy)-18-oxooctadecanoic acid, molecular formula is C22H42O4. In an article, author is SATO, H,once mentioned of 843666-40-0, Product Details of 843666-40-0.
STUDIES ON URICOSURIC DIURETICS .5. CONVENIENT AND EFFICIENT SYNTHESIS OF 2,3-DIHYDROBENZOFURAN DERIVATIVES
A practical procedure for synthesis of a new uricosuric agent, 5-chloro-7,8-dihydro-3-phenylfuro[2,3-g]-1,2-benzisoxazole-7-carboxylic acid (1, AA-193) is described, which starts from 2,5-dichlorophenol (3b) and involves 5-chloro-6-hydroxy-3-phenyl-1,2-benzisoxazole (2) as the key intermediate. Successive treatment of 3b with benzoyl chloride-aluminum chloride (AlCl3) and hot ethanolic sodium hydroxide gives 4-benzoyl-2,5-dichlorophenol (8, 61%), which is oximated with hydroxylamine hydrochloride and then transformed into the benzisoxazole 2 (88%) with potassium hydroxide in N,N-dimethylformamide (DMF) (method C). The reaction of 2 with aqueous formaldehyde and dimethylamine affords the Mannich base Ila (97%), which is treated with a sulfonium ylide 12, 14 or 15 followed by heating with sodium hydroxide (NaOH) in ethanol (EtOH) to give 1 in high yield (method E).
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Reference:
Benzisoxazole – Wikipedia,
,Benzisoxazole – an overview | ScienceDirect Topics