تفاعل #2371536

معادلة التفاعل

1-benzyl-2′-(4-methoxybenzyl)-2′H-spiro[piperidine-4,5′-pyrano[3,2-c]pyrazol]-7′(6′H)-one

trifluoroacetic acid

→

1-benzyl-1′H-spiro[piperidine-4,5′-pyrano[3,2-c]pyrazol]-7′(6′H)-one

المردود 91.7%

المذيبات

1,2-dichloroethane

ظروف التفاعل

المعالجة

1. 1
   تركيزconcentrated to dryness under reduced pressure
2. 2
   استخلاصextracted with 2×50 mL ethyl acetate
3. 3
   تجفيفdried over sodium sulfate
4. 4
   ترشيحfiltered
5. 5
   تركيزconcentrated under reduced pressure
6. 6
   أخرىchromatographed (25 g silica, step gradient 5 column volumes 50% ethyl acetate/heptane, 10 CV 100% ethyl acetate)

الإجراء التجريبي

Dissolved 1-benzyl-2′-(4-methoxybenzyl)-2′H-spiro[piperidine-4,5′-pyrano[3,2-c]pyrazol]-7′(6′H)-one (428 mg, 1.02 mmol) in 20 mL 1,2-dichloroethane and treated with 10 mL trifluoroacetic acid. The resultant mixture was heated for 18 h at 90° C. The reaction was cooled to ambient temperature and concentrated to dryness under reduced pressure. The resultant residue was taken up in 50 mL saturated aqueous sodium bicarbonate and extracted with 2×50 mL ethyl acetate. The organic extracts were combined and dried over sodium sulfate, filtered and concentrated under reduced pressure. The resultant oil was flash chromatographed (25 g silica, step gradient 5 column volumes 50% ethyl acetate/heptane, 10 CV 100% ethyl acetate) to yield 278 mg (91%) of 1-benzyl-1′H-spiro[piperidine-4,5′-pyrano[3,2-c]pyrazol]-7′(6′H)-one as a pale yellow solid. 1H NMR (400 MHz, CD3OD) δ ppm 7.27 (m, 6H), 3.55 (s, 2H), 2.64 (m, 4H), 2.45 (td, J=11.7, 2.5 Hz, 2H), 2.06 (d, J=12.1 Hz, 2H), 1.74 (m, 2H); m/z (M+1)=298.5.

المصدر