[N+:1]([C:4]1[CH:12]=[CH:11][CH:10]=[C:6]([C:7]([OH:9])=O)[C:5]=1[OH:13])([O-:3])=[O:2].F[P-](F)(F)(F)(F)F.Br[P+](N1CCCC1)(N1CCCC1)N1CCCC1.C(N(CC)C(C)C)(C)C.[NH:47]1[CH2:51][CH2:50][C@@H:49]([OH:52])[CH2:48]1>ClCCl>[OH:13][C:5]1[C:4]([N+:1]([O-:3])=[O:2])=[CH:12][CH:11]=[CH:10][C:6]=1[C:7]([N:47]1[CH2:51][CH2:50][C@@H:49]([OH:52])[CH2:48]1)=[O:9]
A mixture of 4.86 g (26 mmol, 1 eq) of 3-nitrosalicylic acid and 12.16 g (26 mmol, 1 eq) of bromotripyrrolidinophosphonium hexafluorophosphate in 65 ml of dichloromethane and in the presence of 13.7 ml (78 mmol, 3 eq) of N,N-diisopropylethylamine was stirred at ambient temperature for 30 minutes. 4.52 g (4.10 mmol, 2 eq) of (R)-(+)-3-pyrrolidinol in solution in 10 ml of dichloromethane were added dropwise and the reaction medium was stirred at ambient temperature overnight. The reaction medium was extracted with a 1 N sodium hydroxide solution and separated by settling out. The aqueous phase was acidified with a 1N hydrochloric acid solution and extracted with ethyl acetate (5×150 ml). The organic phases were combined, dried over magnesium sulfate, filtered and evaporated. 7.83 g of (2-hydroxy-3-nitrophenyl)-((R)-3-hydroxypyrrolidin-1-yl)methanone were obtained in the form of a golden yellow amorphous solid. Crude yield>100%. HPLC: 93% [252].
Wird geladen…
