تفاعل #572855

معادلة التفاعل

ammonium hydroxide

sodium nitrite

phosphoric acid

trans-(±)-2-amino-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinoline

phosphoric acid

hypophosphorus acid

→

trans-(±)-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinoline

المذيبات

water

ظروف التفاعل

المعالجة

1. 1
   أخرىfrom going above about -4° C
2. 2
   workup.ADDITIONThe reaction mixture was then added in dropwise fashion to 10 ml
3. 3
   أخرىkept at a temperature of about 0° C
4. 4
   workup.ADDITIONwas poured over ice
5. 5
   استخلاصThe aqueous layer was extracted several times with chloroform
6. 6
   غسيلthe combined extracts washed, first with water
7. 7
   تجفيفwith saturated aqueous sodium chloride, and then dried
8. 8
   أخرىRemoval of the chloroform in vacuo

الإجراء التجريبي

A solution of 0.24 g. of trans-(±)-2-amino-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinoline in 10 ml. of 85% phosphoric acid was cooled to about -8° C. A saturated solution of 1.17 g. of sodium nitrite in water was added below the surface of the phosphoric acid solution at such a rate as to keep the reaction temperature from going above about -4° C. The reaction mixture was then added in dropwise fashion to 10 ml. of 50% aqueous hypophosphorus acid kept at a temperature of about 0° C. This new reaction mixture was stirred until gas evolution had ceased, at which time it was poured over ice. The aqueous mixture was made strongly basic with aqueous ammonium hydroxide. The aqueous layer was extracted several times with chloroform. The chloroform extracts were combined, and the combined extracts washed, first with water and then with saturated aqueous sodium chloride, and then dried. Removal of the chloroform in vacuo yielded trans-(±)-5-n-propyl-4,4a,5,6,7,8,8a,9-octahydrothiazolo[4,5-g]quinoline free base having the following physical characteristics: tlc (9:1 CHCl3 /MeOH+Tr.NH4OH)Rf =0.70.

المصدر