تفاعل #1833300

معادلة التفاعل

bendamustine hydrochloride

5-decanol

dicyclohexylcarbodiimide

→

product

المردود 104.7%

4-{5-[Bis-(chloroethyl)-amino]-1-methyl-1H-benzimidazol-2-yl}butyric acid 5-decyl ester

المردود 104.7%

المذيبات

1,2-ethylene dichloride

ظروف التفاعل

المعالجة

1. 1
   أخرىSolids were removed by vacuum filtration
2. 2
   غسيلwashed with 5 mL of EDC
3. 3
   غسيلThe filtrate was washed with 4% aqueous sodium bicarbonate solution (1×50 mL)
4. 4
   تجفيفbefore drying over sodium sulfate
5. 5
   ترشيحfiltering
6. 6
   تركيزconcentrating to dryness in vacuo
7. 7
   أخرىthe combined batches were chromatographed
8. 8
   غسيلeluting with first 2 L of heptanes
9. 9
   workup.ADDITIONProduct containing fractions
10. 10
    تركيزconcentrated to dryness in vacuo

الإجراء التجريبي

A 250 mL three neck round bottom flask was equipped with an overhead stirrer, thermocouple, temperature controller and nitrogen sweep then charged with 3.0 g (7.6 mmol) of bendamustine hydrochloride, 1.21 g (7.7 mmol, 1.01 eq) of 5-decanol, 1.59 g (7.7 mmol, 1.01 eq) of dicyclohexylcarbodiimide (DCC), 30 mL of 1,2-ethylene dichloride (EDC) and 0.1 g (0.76 mmol, 0.1 eq) of DMAP. The reaction was stirred at 75° C. for five days until an in process analysis indicated the reaction was complete. Solids were removed by vacuum filtration and washed with 5 mL of EDC. The filtrate was washed with 4% aqueous sodium bicarbonate solution (1×50 mL) before drying over sodium sulfate, filtering and concentrating to dryness in vacuo. The residue was combined with the residue from a 10 g batch run carried out under the same conditions and the combined batches were chromatographed. The chromatography was carried out using 100 g of silica gel 60, 230-400 mesh, eluting with first 2 L of heptanes, then 1 L of 3:1 heptane/EtOAc and 1 L of 2:1 heptane/EtOAc collecting 100 mL fractions. Product containing fractions were combined and concentrated to dryness in vacuo to yield 3.97 g (7.96 mmol, 24.2%) of the product as a clear yellow oil with an HPLC purity of 99.4A %. 1H NMR (400 MHz, DMSO-d6) δ 7.31 (d, J=8.76 Hz, 1H), 6.93 (d, J=2.28 Hz, 1H), 6.78 (dd, J=2.40, 8.80 Hz, 1H), 4.8 (m, 1H), 3.7 (s, 8H), 3.65 (s, 3H), 2.83 (t, J=7.4 Hz, 2H), 2.44 (t, J=7.36 Hz, 2H), 2.02 (m, 2H), 1.48 (m, 4H), 1.25 (s, b, 10H), 0.84 (m, 6H).

المصدر