Hydrochloric Acid → (E)-benzyl 3-(((3S,6S,7R,8S)-8-benzyl-3-((tert-butoxycarbonyl)amino)-6-methyl-4-oxo-1,5-dioxonan-7-yl)oxy)acrylate

HRID 75746Notes

Reaction equation

HRID 75746 reaction equation
[CH2:1]([C@@H:8]1[C@@H:16]([OH:17])[C@H:15]([CH3:18])[O:14][C:13](=[O:19])[C@@H:12]([NH:20][C:21](=[O:27])[O:22][C:23]([CH3:26])([CH3:25])[CH3:24])[CH2:11][O:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:28]([O:32][CH2:33][C:34]1[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=1)(=[O:31])[C:29]#[CH:30].Cl>C(Cl)Cl.C1N2CCN(CC2)C1>[CH2:1]([C@H:8]1[CH2:9][O:10][CH2:11][C@H:12]([NH:20][C:21]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:27])[C:13](=[O:19])[O:14][C@@H:15]([CH3:18])[C@@H:16]1[O:17]/[CH:30]=[CH:29]/[C:28]([O:32][CH2:33][C:34]1[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=1)=[O:31])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 543064Benzyl propiolateHCID 86701245tert-butyl ((3S,7S,8R,9S)-7-benzyl-8-hydroxy-9-methyl-2-oxo-1,5-dioxonan-3-yl)carbamate

Product 1

HCID 86701240(E)-benzyl 3-(((3S,6S,7R,8S)-8-benzyl-3-((tert-butoxycarbonyl)amino)-6-methyl-4-oxo-1,5-dioxonan-7-yl)oxy)acrylateYield 96%

Reagents, catalysts & solvents 2

HCID 9237DabcoCatalystHCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

To a solution of tert-butyl ((3S,7S,8R,9S)-7-benzyl-8-hydroxy-9-methyl-2-oxo-1,5-dioxonan-3-yl)carbamate (360 mg, 0.949 mmol, 1.00 equiv) in CH2Cl2 (9.5 mL, 0.1 M) at 0° C. (ice water bath) were added benzyl propiolate (228 mg, 1.42 mmol, 1.5 equiv) and DABCO (5 mg, 0.05 mmol, 0.05 equiv). The resulting solution was stirred at 0° C. for 20 min and then poured into 0.1 N HCl (20 mL). The mixture was extracted with CH2Cl2 (3×20 mL), and the combined organic extracts were dried over Na2SO4, filtered, and concentrated to provide a white crystalline solid. The solid was purified by automated silica gel column chromatography (5-25% acetone in hexanes) to provide (E)-benzyl 3-(((3S,6S,7R,8S)-8-benzyl-3-((tert-butoxycarbonyl)amino)-6-methyl-4-oxo-1,5-dioxonan-7-yl)oxy)acrylate (490 mg, 96%) as a white solid: IR (ATR) 3344, 2982, 2941, 1752, 1717, 1690, 1638, 1527, 1454, 1381, 1205, 1079, 833, 751, 697 cm−1; 1H NMR (400 MHz, CDCl3) δ 7.50 (d, J=12.2 Hz, 1H), 7.40-7.09 (m, 10H), 5.44 (d, J=12.2 Hz, 1H), 5.16 (s, 2H), 5.09 (d, J=8.2 Hz, 1H), 5.01 (dd, J=9.3, 6.4 Hz, 1H), 4.64 (dd, J=15.3, 7.5 Hz, 1H), 3.91 (dd, J=11.6, 7.5 Hz, 1H), 3.73 (t, J=9.2 Hz, 1H), 3.45 (dt, J=10.6, 8.5 Hz, 2H), 3.28 (dd, J=11.3, 7.5 Hz, 1H), 2.92 (dd, J=13.8, 3.5 Hz, 1H), 2.34 (t, J=12.4 Hz, 1H), 2.05 (s, 1H), 1.51-1.35 (m, 12H); 13C NMR (100 MHz, CDCl3) δ 172.15, 167.40, 163.21, 138.54, 136.22, 129.10, 128.57, 128.25, 128.19, 126.48, 98.54, 89.01, 80.31, 73.94, 72.60, 71.36, 65.87, 52.72, 46.48, 35.21, 28.26, 18.74; HRMS-ESI (m/z) [M+Na]+ calc'd for C30H37NO8Na, 562.2411. found, 562.2427.

Workup

  1. extractionThe mixture was extracted with CH2Cl2 (3×20 mL)
  2. dry with materialthe combined organic extracts were dried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customto provide a white crystalline solid
  6. customThe solid was purified by automated silica gel column chromatography (5-25% acetone in hexanes)

Sources & evidence

ORD record
ord-9f396a7a26ed4c709343a44ef3efecfb
Source dataset
uspto-grants-2014_09
Patent number
US08835462B2

Reaction notes

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