HuagongsheHuagongshe Chemistry Print Report · For research reference only
Diisopropylethylamine → (S)-2-[(S)-3-(4-Allyloxy-phenyl)-2-tert-butoxycarbonylamino-propionylamino]-3-methyl-butyric acid methyl ester
Participants
| Role | Name | HCID | Charge |
|---|---|---|---|
| Reactant | Diisopropylethylamine | HCID 81531 | — |
| Reactant | Methyl valinate hydrochloride | HCID 111190 | — |
| Reactant | Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1) | HCID 9886157 | — |
| Reactant | (2S)-2-{[(tert-butoxy)carbonyl]amino}-3-[4-(prop-2-en-1-yloxy)phenyl]propanoic acid | HCID 10853202 | — |
| Solvent | Dimethylformamide | HCID 6228 | — |
| Solvent | Ethyl Acetate | HCID 8857 | — |
| Product | (S)-2-[(S)-3-(4-Allyloxy-phenyl)-2-tert-butoxycarbonylamino-propionylamino]-3-methyl-butyric acid methyl ester | HCID 14632374 | — |
Reaction Steps
N-BOC-O-allyl-tyrosine (5.0 g, 16.3 mmol), HATU (17.9 mmol) and valine methyl ester hydrochloride (32.6 mmol) were dissolved in anhydrous DMF (25 mL). DIPEA (22.7 mL, 65 mmol) was added and the reaction mixture was stirred at rt for 18 h before being partitioned between EtOAc and 1M hydrochloric acid. The organic phase was then washed sequentially with 1M hydrochloric acid and brine before being dried (MgSO4), filtered and concentrated in vacuo. Purification was achieved using flash chromatography, eluting with a gradient of (50/70) petroleum ether to EtOAc to yield a white solid, 6.08 g, 69%. Rf=0.29 (1/2 EtOAc/(50/70) petroleum ether). m.p. 74-76° C.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|---|
| Patent number | US09434762B2 |
| Source dataset | uspto-grants-2016_09 |
| ORD ID | ord-952aa7f3c11a4c99b1e70d22926fab41 |
| Source note | uspto-grants-2016_09 |