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23
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4644242908
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note
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Different lipases were screened, among them Pseudomonas cepacia (PS-C) gives good enantioselectivity within 10 h compared to PS-D. Pseudomonas cepacia lipase (PS), Pseudomonas fluorescens (AK-20), Lipozyme immobilized from Mucor miehei, Candida rugosa lipase gave lower enantioselectivities. There were no significant conversions by employing lipases from Candida antartica, Porcine pancreas, and Candida cylindracea
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4644279258
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A number of solvents such as diisopropyl ether, toluene, THF, tert-butyl methyl ether, and hexane were examined for this protocol. It was observed that diisopropyl ether was efficient for this lipase mediated resolution, whereas toluene takes longer (2 days) reaction times and gave comparatively low enantioselectivity. The results employing THF, tert-butyl methyl ether, and hexane were not satisfactory
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4644300925
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General procedure for lipase mediated transesterification: To a solution of (±)-trans-3-azido-1-Cbz-4-hydroxypyrrolidine 7 (1 mmol) in diisopropyl ether (10 mL) was added lipase PS-C (1 equiv w/w), vinyl acetate (6 mmol). The suspension was shaken at 150 rpm at 40°C. The reaction mixture was monitored by chiral HPLC analysis until it reached about 50% conversion (10 h). The reaction was filtered and the filtrate was washed with water followed by brine. The organic layer was dried over anhydrous sodium sulfate, concentrated under reduced pressure, and purified by silica gel column chromatography. The enantiopurity of the products (3S,4S)-7 and (3R,4R)-8 were determined by a chiral HPLC using Chiralcel OD column (hexane-isopropanol, 80:20) with 0.5 mL/min flow rate and compared with the corresponding racemic products
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