تفاعل #66046
ord-531f6737d71943819bcf251a7cbae129
معادلة التفاعل
الكواشف
ظروف التفاعل
المعالجة
- 1أخرىthe THF was removed in vacuo
- 2استخلاصThe aqueous layer was extracted with diethyl ether (40 mL)
- 3أخرىto remove unreacted
- 4استخلاصthe resulting precipitate was extracted with DCM (3×40 mL)
- 5تجفيفThe combined DCM fractions were dried
- 6أخرىevaporated
الإجراء التجريبي
To a solution of 52 (900 mg, 3.25 mmol) in THF/water, 3:1 (10 mL) was added lithium hydroxide monohydrate (273 mg, 6.5 mmol), and the resulting suspension was allowed to stir for 16 h. The reaction mixture was diluted with water (30 mL) and the THF was removed in vacuo. The aqueous layer was extracted with diethyl ether (40 mL) to remove unreacted starting material. The aqueous phase was acidified with 10% HCl and the resulting precipitate was extracted with DCM (3×40 mL). The combined DCM fractions were dried and evaporated to yield the title compound (750 mg, 2.85 mmol, 88%) as a white solid. [α]D23 −23.2 (c. 0.1, EtOH). Mp 75° C. 1HNMR (D6 acetone, 300 MHz): δ 7.27 (d, J=7.8 Hz, 1H, NH); 7.17 (d, J=8.7 Hz, 2H, ArH2′ and ArH6′); 6.86 (d, J=8.7 Hz, 21H, ArH3′ and ArH5′); 6.06 (m, 1H, H2″); 5.40 (dd J=1.5 Hz, 17.5 Hz, 1H, H3a″); 5.23 (dd, J=1.5, 10.5 Hz, 1H, H3b″); 4.67 (dd, J=5.1, 8.1, 10.5 Hz 1H, H2); 4.53 (d, J=5.1 Hz, 2H, H1″); 3.11 (dd, J=5.4, 14.1 Hz, 1H; 3Ha); 2.93 (dd, J=8.1, 14.1, 1H, 3Hb); 1.89 (s, 31H, NCOCH3). Mass Spectrum (CI, +ve) m/z 264 (100%) [MH+]. HRMS calcd for C14H18NO4 264.123583, found 264.123770.