1068522-32-6|Ethyl 5-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydro-2H-pyran-4-carboxylate| Ambeed

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CAS No. :	1068522-32-6
Formula :	C₉H₁₁F₃O₆S
M.W :	304.24
SMILES Code :	O=C(C1=C(OS(=O)(C(F)(F)F)=O)COCC1)OCC

Yield	Reaction Conditions	Operation in experiment
	With trifluoromethylsulfonic anhydride;	Step 1: To a solution of <strong>[388109-26-0]ethyl 3-oxotetrahydro-2H-pyran-4-carboxylate</strong> (1.0 g, 5.81 mmol) in DCM (30 mL) was added DIPEA (1.22 mL, 6.97 mmol) and Tf2O (1.08 mL, 6.39 mmol) at -78 C., then it was warmed up to room temperature and stirred at room temperature for 2 h, the solution was diluted with DCM, washed with Sat. NaHCO3, brine, dried and concentrated to give ethyl 5-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydro-2H-pyran-4-carboxylate as crude product (2 g).
	With trifluoromethylsulfonic anhydride;	Step 1 To a solution of <strong>[388109-26-0]ethyl 3-oxotetrahydro-2H-pyran-4-carboxylate</strong> (1.0 g, 5.81 mmol) in DCM (30 mL) was added DIPEA (1.22 mL, 6.97 mmol) and Tf2O (1.08 mL, 6.39 mmol) at -78 C., then it was warmed up to room temperature and stirred at room temeperature for 2 h, the solution was diluted with DCM, washed with Sat. NaHCO3, brine, dried and concentrated to give ethyl 5-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydro-2H-pyran-4-carboxylate as crude product (2 g).

Yield	Reaction Conditions	Operation in experiment
100%	With N-ethyl-N,N-diisopropylamine; In dichloromethane; at -78 - 20℃; for 4.5h;Inert atmosphere;	To a solution of <strong>[388109-26-0]ethyl 3-oxotetrahydro-2H-pyran-4-carboxylate</strong> (1.01 g, 5.58 mmol,) dissolved in DCM (28 mL) and cooled under N2 to -78C, was added DIPEA (1.2 mL, 6.9 mmol). The reaction mixture was stirred under N2, then a 1M solution of trifluoromethanesulfonic anhydride in DCM (6.07 mL, 6.07 mmol) was added. The reaction mixture was stirred at -78C for 30 minutes, then warmed to r.t. and stirred for 4 h. Saturated aqueous NaHCO3 solution (30 mL) was added. The mixture was stirred rapidly at room temperature for 5 minutes, then filtered. The organic layer was concentrated in vacuo to afford ethyl 5-(trifluoromethylsulfonyloxy)-3,6-dihydro-2H- pyran-4-carboxylate (1.7 g, quantitative) as a brown oil.
	With N-ethyl-N,N-diisopropylamine; In dichloromethane; at -78 - 20℃; for 2.0h;	Step 1 To a solution of <strong>[388109-26-0]ethyl 3-oxotetrahydro-2H-pyran-4-carboxylate</strong> (1.0 g, 5.81 mmol) in DCM (30 mL) was added DIPEA (1.22 mL, 6.97 mmol) and Tf2O (1.08 mL, 6.39 mmol) at -78 C., then it was warmed up to room temperature and stirred at room temperature for 2 h, the solution was diluted with DCM, washed with Sat. NaHCO3, brine, dried and concentrated to give ethyl 5-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydro-2H-pyran-4-carboxylate as crude product (2g).
	With N-ethyl-N,N-diisopropylamine; In dichloromethane; at -78 - 20℃; for 2.0h;	O1 161 Step 1: i?o a solution of eth I 3-oxotetrahvdro2i 1.p ran-4-?carhoxvlate (1 0 g, 5.8mmo )in 1X?M (30 mu was added D1PI.A 1 .22 ml., 6.97 mmcl) and FfO (1 08 ml., 6.39mmoi at 78 C. then it us warmed up to room temperature and stirred at roomtemepemature fhr 2 h, the o1ution as diluted with DCM, ashcd with Sat. aH(O, brine.dried and concentated to give eih3 I 5?1((trifluoronieth l)sulton I oxy).?3,6?dih dio-21 lp mam4-cai boxy late as crude product (2 ,

	With N-ethyl-N,N-diisopropylamine; In dichloromethane; at -78 - 20℃; for 2.0h;	Step 1:To a solution of <strong>[388109-26-0]ethyl 3-oxotetrahydro-2H-pyran-4-carboxylate</strong> (1.0 g, 5.81 mmol) in DCM (30 mL) was added DIPEA (1.22 mL, 6.97 mmol) and Tf2O (1.08 mL, 6.39 mmol) at -78 C., then it was warmed up to room temperature and stirred at room temperature for 2 h, the solution was diluted with DCM, washed with Sat. NaHCO3, brine, dried and concentrated to give ethyl 5-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydro-2H-pyran-4-carboxylate as crude product (2 g).
	With N-ethyl-N,N-diisopropylamine; In dichloromethane; at 0 - 20℃;	To a solution of <strong>[388109-26-0]ethyl 3-oxotetrahydro-2H-pyran-4-carboxylate</strong> (4.40 g, 25.50 mmol) and DIEA (13.21 ml, 76.66 mmol) in 120 ml of DCM at 0 C was added triflic anhydride (4.62 ml, 28.11 mmol) and the mixture was allowed to stir overnight at room temperature. DCM was removed under vacuum and the residue dissolved in EtOAc and washed with 1 N HCI and then brine. The mixture was dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was purified on a silica gel column eluting with 20% EtOAc/heptane to yield ethyl 5-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydro-2H- pyran-4-carboxylate as a light brown oil. Mass spectrum (ESI, m/z): Calculated for C9H11F3O6S, 305.2 (M+H), Measured 305.0.

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CAS No.: 1068522-32-6

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CAS No.: 1068522-32-6

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[ 1068522-32-6 ] Synthesis Path-Downstream 1~3

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Prevention
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