تفاعل #2367075

معادلة التفاعل

4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

cesium carbonate

{1-[(benzyloxy)methyl]cyclopropyl}methyl methanesulfonate

Compound 63D

{1-[(benzyloxy)methyl]cyclopropyl}methyl methanesulfonate

water

→

required compound

المردود 73.4%

1-({1-[(benzyloxy)methyl]cyclopropyl}methyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

المردود 73.4%

المذيبات

DMF

DMF

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةheated to 70° C. for 24 hrs
2. 2
   درجة الحرارةThe reaction mixture was cooled to RT
3. 3
   استخلاصextracted with ethyl acetate
4. 4
   تجفيفdried over sodium sulfate
5. 5
   ترشيحfiltered
6. 6
   تركيزconcentrated

الإجراء التجريبي

A solution of (4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (8.62 g, 44.4 mmol) in DMF (12 mL) was treated with cesium carbonate (14.6 g, 44.4 mmol) and stirred at RT for 10 min. A solution of {1-[(benzyloxy)methyl]cyclopropyl}methyl methanesulfonate (Compound 63D, 12 g, 44.4 mmol) in DMF was added and heated to 70° C. for 24 hrs. The reaction mixture was cooled to RT, poured into water, extracted with ethyl acetate, dried over sodium sulfate, filtered and concentrated to give 12 g (73%) of required compound as a colorless gum which was used without further purification. 1H NMR (600 MHz, CDCl3) δ 7.78 (s, 1H), 7.68 (s, 1H), 7.25-7.34 (m, 5H), 4.48 (s, 2H), 4.15 (s, 2H), 3.16 (s, 2H), 1.33 (s, 12H), 0.71 (s, 2H), 0.56 (s, 2H).

المصدر