Triethylamine → Pivaloyloxymethyl 3-methyl-7-(2-phenoxyacetamido)ceph-3-em-4-carboxylate

Participants

Reaction Steps

3-Methyl-7-(2-phenoxyacetamido)ceph-3-em-4-carboxylic acid (69.6 g., 0.2 mole) was dissolved in 300 ml. of dimethylformamide and reacted in sequence with triethylamine (20.2 g., 0.2 mole), potassium bicarbonate (40 g., 0.4 mole) and chloromethyl pivalate (33 g., 0.22 mole) according to procedures detailed in Preparation B 1. To isolate the product, the reaction mixture was diluted with 3 l. of ether, and the organic solution washed, dried and evaporated to dryness, as detailed in Preparation 1, affording pivaloyloxymethyl 3-methyl-7-(2-phenoxyacetamido)ceph-3-em-4-carboxylate [75.5 g., 82%; ir (CH2Cl2) 1776, 1750, 1685 cm-1 ].

Provenance & Evidence