Formaldehyde → 1-(diphenylmethyl)-3-(5-hydroxy-2,3-dihydro-1-benzofuran-6-yl)-3-(hydroxymethyl)-1,3-dihydro-2H-indol-2-one

To a solution of 1-(diphenylmethyl)-3-(5-hydroxy-2,3-dihydro-1-benzofuran-6-yl)-1,3-dihydro-2H-indol-2-one (1.01 g, 2.30 mmol) in THF (50.0 mL) was added paraformaldehyde (1.00 g, 30.0 mmol). Argon was bubbled through the reaction mixture for one hour followed by the addition of diisopropylamine (1.00 g, 10.0 mmol) at 0° C. The reaction mixture was stirred at ambient temperature for 20 hours and diluted with ethyl acetate (100 mL). The resulting mixture was washed with water (2×50.0 mL), dried over sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness to give 0.67 g (65%) of the title compound: MS (ES+) m/z 486.4 (M+23).

1. customArgon was bubbled through the reaction mixture for one hour
2. washThe resulting mixture was washed with water (2×50.0 mL)
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationThe filtrate was concentrated in vacuo to dryness

ORD record

ord-e07a21e43974497ab62534c640d3f52f

Source dataset

uspto-grants-2010_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07700641B2