Ethyl vinyl ether → 1-Bromo-5-vinyloxy-cyclopentene

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%).

1. customThe mixture was quenched with 5% NaOH (150 mL)
2. filtrationfiltered through celite
3. concentrationThe residue was concentrated

ORD record

ord-23a373f342e84df88f508be7b6bf9eea

Source dataset

uspto-grants-2008_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07419994B2