Diethyl Ether → HCID 67527148, compound

Temperature

-60 °C

A solution of 3-chloro-naphthalenecarbaldehyde (1.93 g) in dry THF (12 mL) was added dropwise to lithium bis(trimethylsilyl)-amide 1M solution in THF (10.1 mL) at −30° C. under a Nitrogen atmosphere. The resulting yellow mixture was stirred under a Nitrogen atmosphere from −30° C. to −5° C. for 1 h, then it was cooled down to −60° C. and methyllithium 1.6M solution in Et2O (11 mL) was added keeping the internal temperature of the reaction mixture <−55° C. The resulting dark violet reaction mixture was stirred for 40 minutes at −50° C. under a Nitrogen atmosphere, then it was carefully quenched at −50° C. with aqueous 2M HCl (30 mL) until pH=2. The reaction was concentrated in vacuo and the aqueous residue washed with 1:1 CH/Et2O (50 mL). The separated aqueous phase was then made basic (pH=14) at 0° C. with NaOH pellets. This basic aqueous phase was extracted with Et2O (3×60 mL), the collected organic layers were dried and concentrated in vacuo to give the title compound (1.12 g) as a yellow oil.

1. customthe internal temperature of the reaction mixture <−55° C
2. stirringThe resulting dark violet reaction mixture was stirred for 40 minutes at −50° C. under a Nitrogen atmosphere
3. customit was carefully quenched at −50° C. with aqueous 2M HCl (30 mL) until pH=2
4. concentrationThe reaction was concentrated in vacuo
5. washthe aqueous residue washed with 1:1 CH/Et2O (50 mL)
6. customat 0° C.
7. extractionThis basic aqueous phase was extracted with Et2O (3×60 mL)
8. customthe collected organic layers were dried
9. concentrationconcentrated in vacuo

ORD record

ord-4c39f31bcd434288aff04063a7505080

Source dataset

uspto-grants-2009_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07534893B2