Journal of Chemistry / 2013 / Article / Tab 1

Research Article

Synthesis of New Benzofuran-2-Carboxylic Acid Derivatives

Table 1

Cyclization of ethyl 6-methoxy-4-nitro-2-formylphenoxyacetate (4).

TrialMolar ratio  
Ester 4/K2CO3
Reaction time (h)Product 2c  
Yield (%)*

11 : 13
21 : 13.552
31 : 1460
41 : 1.3359
51 : 1.33.564
61 : 1.3473

The yield was calculated relative to the starting ester 4.

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