[C:1]1([C:11]2([CH2:16][OH:17])[CH2:15][CH2:14][CH2:13][CH2:12]2)[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1.C(N(CC)CC)C.[S:25](Cl)([CH3:28])(=[O:27])=[O:26].C(OCC)(=O)C>ClCCl.CCCCCC>[C:1]1([C:11]2([CH2:16][O:17][S:25]([CH3:28])(=[O:27])=[O:26])[CH2:15][CH2:14][CH2:13][CH2:12]2)[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1To a solution of (1-naphthalen-1-yl-cyclopentyl)-methanol (340) (9.0 g, 39.8 mmol) in dichloromethane (180 mL) was added triethylamine (11.0 mL, 79.5 mL) and the reaction mixture was cooled to 0° C. To this reaction mixture was added mesylchloride and stirring was continued at room temperature for 18 h (silica TLC, 10% ethyl acetate in hexane; Rf=0.2). The reaction mass was diluted with dichloromethane (100 mL), washed with water (2×100 mL) and brine (100 mL) and dried and concentrated in vacuum to get a crude mass which was purified by Combi-Flash using gradient eluent mixture of ethyl acetate and hexane to get pure methanesulfonic acid 1-naphthalen-1-yl-cyclopentylmethyl ester (341) (4.25 g, 35%) as a white solid.
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