Chemtech steroids

The synthesis starts with the condensation of 3-acetylacetanilide [29] [30] ( 1 ) with N , N -dimethylformamide dimethyl acetal ( DMFDMA ) [31] to give the eneamide ( 2 ). The anilide nitrogen is then alkylated by means of sodium hydride and ethyl iodide to give 3 . The first step in the condensation with 3-amino-4-cyanopyrazole can be visualized as involving an addition-elimination reaction sequence on the eneamide function to give a transient intermediate such as 5 . Cyclization then leads to formation of the fused pyrimidine ring to afford zaleplon ( 6 ).

Chemtech steroids

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