Sodium Iodide → 4-trimethylsilanyloxy-7,8-dihydro-6H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester

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Reaction Steps

To a mixture of 4-oxo-5,6,7,8-tetrahydro-4H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester (4.6 mmol), sodium iodide (9.3 mmol), and triethylamine (13.9 mmol) in 15 mL acetonitrile is added trimethylsilyl chloride (9.3 mmol). After stirring at RT for 2 hours it is quenched with 20 mL saturated NaHCO3 solution and extracted several times with EtOAc. The combined organic layers are dried over Na2SO4 and evaporated in vacuo yielding 4-trimethylsilanyloxy-7,8-dihydro-6H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester as a brown oil (95%). 1H NMR (CDCl3) 0.15 (s, 9H), 1.32 (t, 3H), 1.60 (s, 9H), 1.83-1.97 (m, 2H), 1.99-2.06 (m, 2H), 3.00 (t, 2H), 4.33 (q, 2H), 5.40 (t, 1H), 7.62 (s, 1H). Step 2:

Provenance & Evidence