反応 #9390

反応方程式

Methyl cyanoformate

HMPA

LDA

4-(2-benzyloxy-ethyl)-cyclohexanone

→

5-(2-Benzyloxy-ethyl)-2-oxo-cyclohexanecarboxylic acid methyl ester

溶媒

THF

反応条件

後処理

1. 1
   温度before re-cooling to −78° C.
2. 2
   その他before aqueous quench
3. 3
   その他The product was purified by chromatography on SiO2 with 10% EtOAc

実験手順

A solution of LDA (33 ml, 1.5 M in Et2O) in THF (50 mL) at −78° C. was treated with 4-(2-benzyloxy-ethyl)-cyclohexanone (9.5 g, 40.2 mmol). The mixture was warmed to 0° C. over 30 m before re-cooling to −78° C. and adding HMPA (7 mL). Methyl cyanoformate (4.1 mL, 85 mmol) was added and the mixture was stirred for 15 m before aqueous quench and work-up. The product was purified by chromatography on SiO2 with 10% EtOAc:Hx. 5-(2-Benzyloxy-ethyl)-2-oxo-cyclohexanecarboxylic acid methyl ester was isolated, 5.8 g (49%) and reduced with an equivalent of NaBH4 in MeOH at −10° C. to provide the alcohol (Intermediate R2). Intermediate R2 was purified by chromatography on SiO2 with 30 to 50% EtOAC:Hx. (˜90% yield).

出典