6-Bromo-4-isochromanone

Step Two; 6-Bromo-isochroman-4-one; 0 Bt\ . COoH i AD) i . Br C02H 1. Ac2O 0 i OC02H 2. Basic Resin i O A solution of Bromo-2-carboxymethoxymethyl-benzoic acid in acetic anhydride (350 mL) containing potassium acetate (170 g) was heated at reflux for 2 h. The reaction mixture was cooled to room temperature and concentrated under reduced pressure and the residue partitioned between ethyl acetate and water. The phases were separated and the aqueous phase extracted with ethyl acetate. The combined ethyl acetate phase was then washed with saturated sodium chloride, dried (sodium sulfate), filtered, and concentrated to yield a red semi-solid. Purification by flash column chromatography over silica (85 : 15 hexanes/ethyl acetate) gave the enol acetate (7.59 g, 29percent for three steps) as a golden syrup : 1H NMR (300 MHz, CDC13) 8 7.37 (dd, J = 8.2, 1.9 Hz, 1H), 7.19 (d, J = 1.9 Hz, 1H), 6.82 (d, J = 8.2 Hz, 1H), 5.04 (s, 2H), 2.29 (s, 3H). Unactivated Dowex 500A OH anion exchange resin (1 g) added in one portion to a solution of the acetate enol acetate (5.95 g, 22.11 mmol) in methanol (50 mL) and the reaction mixture stirred at room temperature overnight. The reaction mixture was gravity filtered and the resin washed with fresh methanol. The combined filtrate was then concentrated under reduced pressure to yield 6-Bromo- isochroman-4-one (4.32 g, 86percent) as a yellow oil, which solidified on standing

Molecular Weight:227.05
XLogP3:1.8
Hydrogen Bond Acceptor Count:2
Exact Mass:225.96294
Monoisotopic Mass:225.96294
Topological Polar Surface Area:26.3
Heavy Atom Count:12
Complexity:193
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes