反応 #2122493

反応方程式

ethyl chloroformate

4-Hydroxy-8-methoxy-3-(2,4,6-trimethyl-phenyl)-1-thia-8-aza-spiro[4.5]dec-3-en-2-one

4-hydroxy-8-methoxy-3-(2,4,6-trimethyl-phenyl)-1-thia-8-aza-spiro[4.5]dec-3-en-2-one

triethylamine

→

carbonic acid ethyl ester 8-methoxy-2-oxo-3-(2,4,6-trimethyl-phenyl)-1-thia-8-aza-spiro[4.5]dec-3-en-4-yl ester

収率 29.7%

溶媒

tetrahydrofuran

tetrahydrofuran

反応条件

後処理

1. 1
   その他partitioned between saturated aqueous sodium bicarbonate and t-butylmethyl ether
2. 2
   乾燥the organic layer dried over sodium sulfate
3. 3
   その他the solvent evaporated
4. 4
   その他The residue was purified by chromatography on silica gel with ethylacetate/cyclohexane (1:2) as a solvent

実験手順

94 mg 4-Hydroxy-8-methoxy-3-(2,4,6-trimethyl-phenyl)-1-thia-8-aza-spiro[4.5]dec-3-en-2-one (from Step 7) and 43 mg triethylamine were dissolved in 10 ml tetrahydrofuran, and a solution of 32 mg ethyl chloroformate in 5 ml tetrahydrofuran was added dropwise. The mixture was stirred at ambient temperature for 18 hours, then partitioned between saturated aqueous sodium bicarbonate and t-butylmethyl ether, the organic layer dried over sodium sulfate, and the solvent evaporated. The residue was purified by chromatography on silica gel with ethylacetate/cyclohexane (1:2) as a solvent, to give 34 mg carbonic acid ethyl ester 8-methoxy-2-oxo-3-(2,4,6-trimethyl-phenyl)-1-thia-8-aza-spiro[4.5]dec-3-en-4-yl ester (title compound P1.7) as a solid, mp 87-89° C.

出典