Acetic Acid → (2-{4-[6-Ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enylamino}-ethyl)-phosphonic acid diethyl ester

HRID 2282050Notes

Reaction equation

HRID 2282050 reaction equation
[CH2:1]([C:3]1[C:11]([CH3:12])=[C:10]2[C:6]([C:7](=[O:13])[O:8][CH2:9]2)=[C:5]([O:14][CH2:15][CH2:16][Si:17]([CH3:20])([CH3:19])[CH3:18])[C:4]=1[CH2:21][CH:22]=[C:23]([CH3:26])[CH:24]=O)[CH3:2].C(O)(=O)C(O)=O.[CH2:33]([O:35][P:36]([CH2:41][CH2:42][NH2:43])(=[O:40])[O:37][CH2:38][CH3:39])[CH3:34].C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>CN(C=O)C>[CH2:38]([O:37][P:36]([CH2:41][CH2:42][NH:43][CH2:26][C:23]([CH3:24])=[CH:22][CH2:21][C:4]1[C:5]([O:14][CH2:15][CH2:16][Si:17]([CH3:20])([CH3:18])[CH3:19])=[C:6]2[C:10](=[C:11]([CH3:12])[C:3]=1[CH2:1][CH3:2])[CH2:9][O:8][C:7]2=[O:13])(=[O:40])[O:35][CH2:33][CH3:34])[CH3:39]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 2733595Diethyl (2-aminoethyl)phosphonate oxalateHCID 5049666Sodium triacetoxyborohydrideHCID 725636044-[6-Ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enal

Product 1

HCID 72563615(2-{4-[6-Ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enylamino}-ethyl)-phosphonic acid diethyl esterYield 98.7%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

4-[6-Ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enal (19.7 mg, 0.052 mmol) and aminoethylphosphonic acid diethylester oxalate salt (15.6 mg, 0.057 mmol) were dissolved in DMF (0.5 mL). Acetic acid (15.7 mg, 0.263 mmol) was added, followed by sodium triacetoxyborohydride (22.3 mg, 0.105 mmol). After 4 hrs, the crude reaction mixture was purified by RP-HPLC (eluent: water/MeCN) to provide 27.7 mg (97%) of the desired product after lyophilization. 1H NMR (300 MHz, CDCl3): δ=0.04 (s, 9H), 1.14 (t, J=7.5 Hz, 3H), 1.26 (m, 2H), 1.30 (t, J=7.2 Hz, 6H), 1.95 (s, 3H), 2.19 (s, 3H), 2.23 (m, 2H), 2.68 (q, J=7.5 Hz, 2H), 3.18 (m, 2H), 3.53 (s, 2H), 4.13 (m, 4H), 4.28 (m, 2H), 5.15 (s, 2H), 5.51 (m, 1H) ppm; 31P NMR (121 MHz, CDCl3): δ=27.39 ppm; MS=540 [M++1].

Workup

  1. customthe crude reaction mixture
  2. customwas purified by RP-HPLC (eluent: water/MeCN)

Sources & evidence

ORD record
ord-2b170e46484045b397f09c3cc5a8bcf3
Source dataset
uspto-grants-2015_09
Patent number
US09139604B2

Reaction notes

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