Monomethyl azelate → Nonanoic acid, 9-hydroxy-, methyl ester

To prepare 4, a solution of nonanedioic acid monomethyl ester (3) (923 mg, 4.6 mmol) in dry THF (3 ml) at −20° C. was treated with 1 M BH3 in THF (4.6 ml, 4.6 mmol) over 10 minutes. After stirring at room temperature for 4 hours, the reaction was quenched with 0.77 M aqueous K2CO3 solution (10 ml) at 0° C. The product was extracted with diethyl ether (3×20 ml), washed with saturated aqueous NaCl solution, dried over Na2SO4, and concentrated in vacuum to afford methyl 9-hydroxynonanoate (4) (Kai K. et al., Tetrahedron 64:6760-69 (2008), which is hereby incorporated by reference in its entirety) (850 mg, 99% yield) as a colorless oil, which was used directly without any further purification. 1H NMR (400 MHz, chloroform-d1): δ 1.27-1.37 (8H, m), 1.50-1.66 (4H, m), 2.29 (2H, t, J=7.5 Hz), 3.62 (2H, t, J=6.5 Hz), 3.66 (3H, s). See FIG. 75C.

1. customTo prepare 4
2. customthe reaction was quenched with 0.77 M aqueous K2CO3 solution (10 ml) at 0° C
3. extractionThe product was extracted with diethyl ether (3×20 ml)
4. washwashed with saturated aqueous NaCl solution
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuum

ORDレコード

ord-de53f4a84c124c70ac572bff0bc0d691

出典データセット

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US09445596B2