N1C=CC=CC=1.[O:7]([C:14]1[S:15][C:16]([CH2:19][OH:20])=[CH:17][N:18]=1)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.[CH3:21][C:22]1([CH3:32])[C@@H:24]([CH:25]=[C:26]([Br:28])[Br:27])[C@H:23]1[C:29](Cl)=[O:30].Cl>C1C=CC=CC=1>[CH3:21][C:22]1([CH3:32])[C@@H:24]([CH:25]=[C:26]([Br:27])[Br:28])[C@H:23]1[C:29]([O:20][CH2:19][C:16]1[S:15][C:14]([O:7][C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][CH:13]=2)=[N:18][CH:17]=1)=[O:30]3 ml of pyridine were added dropwise at 5° C. to a solution of 2.1 gof the product of Step B in 50 ml of benzene and 3.5 g of (1R,3R) 2,2-dimethyl-3-[2,2-dibromoethenyl]-cyclopropane-1-carboxylic acid chloride and the mixture was stirred at 20° C. for 8 hours and was poured into aqueous 2N hydrochloric acid. The decanted organic phase was dried and evaporated to dryness under reduced pressure. The residue was chromatographed over silica gel and eluted with a 95-5 benzene-ethyl acetate mixture to obtain 1.45 g of (2-phenoxy-5-thiazolyl)-methyl (1R3R) 2,2-dimethyl-3-[2,2-dibromoethenyl]-cyclopropane-1-carboxylate.
Wird geladen…
