4-Chloromandelic acid → Methyl 2-(4-chlorophenyl)-2-hydroxyacetate

A 250 mL round bottom flask containing 5.6 g (30 mmol) of p-chlorophenyl-α-hydroxyacetic acid and 100 mL of concentrated HCl:MeOH (1:9) was warmed to reflux for 12 hours. The solution was concentrated under reduced pressure, diluted with 250 mL of Et2O and washed once with 30 mL of H2O, twice with 30 mL of NaHCO3 solution, once with 30 mL of H2O and once with 30 mL of brine. The organic layer was dried (Na2SO4) and concentrated leaving 5.0 g (83%) of methyl p-chlorophenyl-α-hydroxyacetate lit m.p. 55° C.) 1H-NMR (CDCl3) δ7.36-7.28 (m, 4H), 5.13 (s, 1 H), 3.72 (s, 3H), 3.67 (br s, 1 H (exchanges with D2O)).

1. temperaturewas warmed
2. temperatureto reflux for 12 hours
3. concentrationThe solution was concentrated under reduced pressure
4. additiondiluted with 250 mL of Et2O
5. washwashed once with 30 mL of H2O, twice with 30 mL of NaHCO3 solution, once with 30 mL of H2O and once with 30 mL of brine
6. dry with materialThe organic layer was dried (Na2SO4)
7. concentrationconcentrated

ORDレコード

ord-9823b85ad13644049b54a6e62b47d07c

出典データセット

uspto-grants-1995_03

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US05399721