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Methyl (S)-2-hydroxy-4-methylpentanoate, PPh3, DIAD, THF.
BnCl or BnBr, K2CO3, CH3CN.
TFA, CH2Cl2.
BnCl or BnBr, K2CO3, CH3CN.
LiAlH4, THF.
Oxalyl chloride, DMSO, Et3N, CH2Cl2,-78 °C.
Ph3P+CH3Br–, n-BuLi, THF.
Grubbs Catalyst-II, benzene, reflux.
