Butyl chloroformate → HCID 18397085, compound

HRID 264577Notes

Reaction equation

HRID 264577 reaction equation
[CH2:1]([Si:3]([CH2:17][CH3:18])([CH2:15][CH3:16])[O:4][C@@H:5]1[C@H:8]([C:9]2[O:10][CH:11]=[CH:12][CH:13]=2)[NH:7][C:6]1=[O:14])[CH3:2].C(N(C(C)C)CC)(C)C.[CH2:28]([O:32][C:33](Cl)=[O:34])[CH2:29][CH2:30][CH3:31]>ClCCl.CN(C1C=CN=CC=1)C>[CH2:17]([Si:3]([CH2:15][CH3:16])([CH2:1][CH3:2])[O:4][C@@H:5]1[C@H:8]([C:9]2[O:10][CH:11]=[CH:12][CH:13]=2)[N:7]([C:33]([O:32][CH2:28][CH2:29][CH2:30][CH3:31])=[O:34])[C:6]1=[O:14])[CH3:18]

Participants

6

Reactant 3

HCID 61140Butyl chloroformateHCID 81531DiisopropylethylamineHCID 15224368HCID 15224368, compound

Product 1

HCID 18397085HCID 18397085, compoundYield 65.6%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent2×

Procedure

(3R,4R)-3-Triethylsilyloxy-4-(2-furyl)azetidin-2-one (0.58 g, 2.17 mmol) in 30 mL of dichloromethane was stirred with diisopropylethyl amine (0.4 mL, 2.30 mmol) and butylchloroformate (0.3 mL, 2.36 mmol) in addition to a catalytic amount of DMAP. The solution was stirred for 1 h and diluted with dichloromethane and washed with brine, dried over MgSO4 and concentrated. The residue was chromatographed over silica gel (eluted with 3:1 hexane/ethyl acetate) to give 523 mg of product (Y: 65%); IR(KBr) 1820, 1734, 1318, 1018, 734 cm-1 ; 1H-NMR (CDCl3, 300 MHz) δ 7.38 (m, 1H), 6.35 (m, 2H), 5.09 (ABq, J=15.5, 5.6 Hz, 2H), 4.14 (m, 2H), 1.56 (m, 2H), 1.28 (s, 2H), 0.87 (t, J=8.7 Hz, 3H), 0.82 (t, J=7.9, 9H), 0.50 (m, 6H); 13C-NMR (CDCl3, 75.5 Hz) δ 165.4, 149.1, 147.6, 142.9, 110.5, 109.9, 77.7, 66.6, 55.9, 30.5, 18.8, 13.6, 6.3, 4.3; DCIMS M+H calcd for C18H29NO5Si: 368, Found: 368.

Workup

  1. washwashed with brine
  2. dry with materialdried over MgSO4
  3. concentrationconcentrated
  4. customThe residue was chromatographed over silica gel (eluted with 3:1 hexane/ethyl acetate)

Sources & evidence

ORD record
ord-087c4b0326fd469fb4fd11c6a48a495d
Source dataset
uspto-grants-1997_07
Patent number
US05646176

Reaction notes

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