反応 #57006

反応方程式

2-bromo-cyclopent-2-enol

Intermediate D3

2-bromo-cyclopent-2-enol

ethyl vinyl ether

→

1-bromo-5-vinyloxy-cyclopentene

反応条件

後処理

1. 1
   その他The mixture was quenched with 5% NaOH (150 mL)
2. 2
   ろ過filtered through celite
3. 3
   濃縮The residue was concentrated

実験手順

A solution of 2-bromo-cyclopent-2-enol (Intermediate D3) (21.7 g, 133.1 mmol) in ethyl vinyl ether (300 mL) was treated with Hg(OAc)2 (31.8 g, 99 mmol) at rt for 60 h. The mixture was quenched with 5% NaOH (150 mL) and filtered through celite. The residue was concentrated to yield 1-bromo-5-vinyloxy-cyclopentene as a pale yellow oil, 14.2 g (46%). 1-Bromo-5-vinyloxy-cyclopentene (14.1 g, 74.4 mmol) in toluene was heated in a re-sealable tube at 130° C. for 24 h. (2-Bromo-cyclopent-2-enyl)-acetaldehyde (Intermediate ONE1) was isolated after flash chromatography on silica gel with hexanes to 5% ethyl acetate:hexanes, 10.4 g (74%).

出典