Iodine → 1-(4-Tetrahydropyranyl)but-1-en-3-one

HRID 1588360Notes

Reaction equation

II.Cl[CH:4]1[CH2:9][CH2:8][O:7][CH2:6][CH2:5]1.CN(C)[CH:12]=[CH:13][C:14](=[O:16])[CH3:15]>O1CCCC1>[O:7]1[CH2:8][CH2:9][CH:4]([CH:12]=[CH:13][C:14](=[O:16])[CH3:15])[CH2:5][CH2:6]1

Participants

Conditions

Temperature: 50 °C

Procedure

10.8 g (400 mmol) of Mg turnings are introduced into 30 ml of tetrahydrofuran containing a catalytic amount of iodine, and 5 ml of 4-chlorotetrahydropyran are added. The mixture is warmed to 50° C., and 45.2 g (375 mmol) of 4-chlorotetrahydropyran, dissolved in 120 ml of tetrahydrofuran, are added dropwise at such a rate that the internal temperature does not exceed 70° C. The mixture is stirred for a further 1 hour and subsequently cooled to room temperature. 42.4 g (375 mmol) of 1-(dimethylamino)but-1-en-3-one are added dropwise to the stirred mixture at such a rate that the reaction temperature does not exceed 30° C. The mixture is subsequently stirred for a further 2 hours and hydrolyzed, and the pH of the solution is adjusted to exactly 7. The phases are separated, and the aqueous phase is extracted several times with 200 ml of ethyl acetate or methyl tert.-butyl ether, dried and subjected to fractional distillation, to give 42.0 g (75%) of 1-(4-tetrahydropyranyl)but-1-en-3-one of boiling point 93° to 95° C./5 mmHg.

Workup

additionare added
additionare added dropwise at such a rate that the internal temperature
customdoes not exceed 70° C
temperaturesubsequently cooled to room temperature
customdoes not exceed 30° C
stirringThe mixture is subsequently stirred for a further 2 hours
customThe phases are separated
extractionthe aqueous phase is extracted several times with 200 ml of ethyl acetate or methyl tert.-butyl ether
customdried
distillationsubjected to fractional distillation

Sources & evidence

ORD record: ord-5a5b9aeebf6b4044904e0ff0258691ea
Source dataset: uspto-grants-1993_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05221753

Reaction notes

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