Acetic Anhydride → Baccatin Iii

HRID 363844

Reaction equation

HRID 363844 reaction equation
[CH3:1][C:2]1[C@@H:19]([OH:20])[CH2:18][C@:14]2([OH:21])[C:15]([CH3:17])([CH3:16])[C:3]=1[C@@H:4]([OH:39])[C:5]([C@@:7]1([CH3:38])[C@H:12]([C@@H:13]2[O:22][C:23]([C:25]2[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=2)=[O:24])[C@:11]2([O:33][C:34]([CH3:36])=[O:35])[CH2:31][O:32][C@@H:10]2[CH2:9][C@@H:8]1[OH:37])=[O:6].[C:40](OC(=O)C)(=[O:42])[CH3:41].C(Cl)Cl.CO>O1CCCC1.FC(F)(F)S([O-])(=O)=O.[Sc+3].FC(F)(F)S([O-])(=O)=O.FC(F)(F)S([O-])(=O)=O>[CH3:1][C:2]1[C@@H:19]([OH:20])[CH2:18][C@:14]2([OH:21])[C:15]([CH3:16])([CH3:17])[C:3]=1[C@@H:4]([OH:39])[C:5]([C@@:7]1([CH3:38])[C@H:12]([C@@H:13]2[O:22][C:23]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)=[O:24])[C@:11]2([O:33][C:34]([CH3:36])=[O:35])[CH2:31][O:32][C@@H:10]2[CH2:9][C@@H:8]1[OH:37])=[O:6].[CH3:1][C:2]1[C@@H:19]([OH:20])[CH2:18][C@:14]2([OH:21])[C:15]([CH3:16])([CH3:17])[C:3]=1[C@@H:4]([O:39][C:40]([CH3:41])=[O:42])[C:5]([C@@:7]1([CH3:38])[C@H:12]([C@@H:13]2[O:22][C:23]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)=[O:24])[C@:11]2([O:33][C:34]([CH3:36])=[O:35])[CH2:31][O:32][C@@H:10]2[CH2:9][C@@H:8]1[OH:37])=[O:6]

Participants

7

Reactant 3

HCID 7918Acetic AnhydrideHCID 15427210-deacetylbaccatin IIIHCID 21226129Dichloromethane methanol

Product 2

HCID 65366Baccatin IiiYield 58%HCID 15427210-deacetylbaccatin IIIYield 18%

Reagents, catalysts & solvents 2

HCID 2734571Scandium(III) triflateCatalystHCID 8028TetrahydrofuranSolvent2×

Procedure

To a solution of 50 mg (91.9 μmol) of 10-deacetylbaccatin III and 13 μL (1.5 eq.) of acetic anhydride in 2.0 mL of freshly distilled tetrahydrofuran 100 μL of a solution of 4.5 mg of commercial scandium trifluoromethanesulfonate in 1.0 mL of tetrahydrofuran was added. The reaction mixture was stirred at room temperature for 48 hours. Usual workup and isolation of the product by means of preparative TLC (Silica 60, CH2Cl2/MeOH 10:1) afforded 9 mg of unreacted 10-deacetylbaccatin III (18%) along with 31 mg of baccatin III (58%). 1H-NMR and Rf-value (TLC) were in accordance with the product from example 1.

Sources & evidence

ORD record
ord-8d7679915d9c41e98caf514da8929edb
Source dataset
uspto-grants-1999_02
Patent number
US05874595

Linked notes

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