Dichloromethane → methyl 3-(1H-indazol-5-yl)-2,2-dimethyl-3-phenylpropanoate

関与物質

反応手順

(1H-Indazol-5-yl)(phenyl)methanol (12.1 g, 54 mmol) was dissolved in 200 mL of dry THF and 200 mL of DCM and cooled to 0 C. Added 1-methoxy-2-methyl-1-(trimethylsiloxy)propene (43.6, 250 mmol) followed by dropwise addition of TiCl4 (60 mL of 1.0 M DCM solution, 60 mmol). After 12 h, the reaction was quenched with MeOH, poured into brine and extracted 2×DCM. The organic layers were dried over MgSO4, filtered, concentrated, and then chromatographed using 1:2 EtOAc/hexane to give 11.1 g (66% yield) of methyl 3-(1H-indazol-5-yl)-2,2-dimethyl-3-phenylpropanoate which was separated by chiral chromatography. MS found: (M+H)+=309.

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