Reaktion #4919

Reaktionsgleichung

methylene chloride

2-chloronicotinic acid

(R)-1-methyl-3-pyrrolidinol

sodium hydride

triphenylphosphine

methane sulfonic acid

methylene chloride

→

(R)-2-(2-Chloroethyl)-2,3-dihydro-4-methylpyrido[3,2-f]-1,4-oxazepin-5-(4H)-one hydrochloride

Lösungsmittel

carbon tetrachloride

tetrahydrofuran

tetrahydrofuran

triethylamine

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturat reflux for 2.5 hr
2. 2
   workup.STIRRINGThe mixture was stirred for 10 min
3. 3
   TemperaturThe mixture was heated
4. 4
   Temperaturto reflux for 4 hr
5. 5
   TemperaturTo the cooled (25° C.) solution
6. 6
   EinengenThe solution was concentrated on the rotary evaporator
7. 7
   Sonstigethe residue was partitioned between methylene chloride and dilute hydrochloric acid
8. 8
   ExtraktionThe methylene chloride was extracted 6 times with dilute hydrochloric acid
9. 9
   Extraktionextracted with chloroform which
10. 10
    Sonstigewas dried
11. 11
    Einengenconcentrated
12. 12
    workup.DISSOLUTIONThe residue was dissolved in isopropyl alcohol
13. 13
    workup.ADDITIONtreated with a solution of hydrogen chloride in isopropyl alcohol
14. 14
    SonstigeOne gram was recrystallized from isopropyl alcohol, m.p. 152°-154° C.

Vorschrift

A solution of 47.4 g (0.3 mole) of 2-chloronicotinic acid and 30 g (0.3 mole) of (R)-1-methyl-3-pyrrolidinol in 400 ml of tetrahydrofuran was added over a period of 1 hr to a stirred suspension of 26.4 g (0.66 mole) of 60% sodium hydride/mineral oil in 500 ml of tetrahydrofuran at 55°-60° C. The mixture was stirred at reflux for 2.5 hr and allowed to cool to 25° C. About 400 ml of methylene chloride was added to the slurry followed by a dropwise addition of 34.5 g (0.36 mole) of methane sulfonic acid in 100 ml of methylene chloride. The mixture was stirred for 10 min and 157 g (0.6 mole) of triphenylphosphine was added followed by 200 ml of carbon tetrachloride. The mixture was heated to reflux for 4 hr. To the cooled (25° C.) solution was added 100 ml of triethylamine at a rapid drop. The solution was concentrated on the rotary evaporator and the residue was partitioned between methylene chloride and dilute hydrochloric acid. The methylene chloride was extracted 6 times with dilute hydrochloric acid. The acid extracts were combined, made basic with sodium hydroxide and extracted with chloroform which was dried and concentrated. The residue was dissolved in isopropyl alcohol and treated with a solution of hydrogen chloride in isopropyl alcohol. The resulting hydrochloride weighed 25 g (30%). One gram was recrystallized from isopropyl alcohol, m.p. 152°-154° C.; [α]D25 =+36.2 (water).

Quelle