تفاعل #635457

معادلة التفاعل

DCM

(S)-[(3-Amino-benzyl)-tert-butoxycarbonyl-amino]-phenyl-acetic acid cyclopentyl ester

6-Formyl-benzo[b]thiophene-2-carboxylic acid (1-isobutoxy-ethoxy)-amide

sodium triacetoxyborohydride

→

desired product

المردود 73.0%

(S)-[tert-Butoxycarbonyl-(3-{[2-(1-isobutoxy-ethoxycarbamoyl)-benzo[b]-thiophen-6-ylmethyl]-amino}-benzyl)-amino]-phenyl-acetic acid cyclopentyl ester

المردود 73.0%

المذيبات

DCE

ظروف التفاعل

المعالجة

1. 1
   غسيلThe solution was washed with saturated sodium bicarbonate (50 ml)
2. 2
   تجفيفdried (MgSO4)
3. 3
   تركيزconcentrated
4. 4
   أخرىpurified by flash column chromatography

الإجراء التجريبي

To (S)-[(3-Amino-benzyl)-tert-butoxycarbonyl-amino]-phenyl-acetic acid cyclopentyl ester (0.317 g, 0.75 mmol) was added 6-Formyl-benzo[b]thiophene-2-carboxylic acid (1-isobutoxy-ethoxy)-amide (Scheme 7) (0.210 g, 0.65 mmol) in DCE (8 ml). 2 drops of glacial acetic acid were added, and then sodium triacetoxyborohydride (0.170 g, 0.8 mmol). The mixture was stirred for 2 h and then poured into DCM (150 ml). The solution was washed with saturated sodium bicarbonate (50 ml), then dried (MgSO4), concentrated and purified by flash column chromatography to yield the desired product as a pale yellow foam (0.346 g, 73% yield). 1H NMR (300 MHz, CDCl3), δ: 8.35-8.43 (1H, m), 7.56-8.05 (2H, m), 7.01-7.41 (8H, m), 6.90-7.01 (1H, m), 6.42 (1H, dd, J=2.6, 7.9 Hz), 5.25-5.31 (1H, m), 5.12 (1H, q, J=5.2 Hz), 4.40 (1H, d, J=5.4 Hz), 4.00 (1H, dd, J=3.1, 15.8 Hz), 3.60-3.70 (1H, m), 3.35-3.40 (1H, m), 1.33-1.94 (21H, m), 0.98 (3H, d, J=6.6 Hz), 0.97 (3H, d, J=6.6 Hz)

المصدر