Scheme 2.
Reagents and conditions: (a) (i) BzOH, DIAD, PPh3, THF, RT, 1 h; (ii) K2CO3, MeOH, RT, 4 h, 93% over two steps. (b) (EtO)2P(O)CH2OTs, NaH, DMF, RT, 3 days. (c) TMSBr, DMF, RT, 24 h, 24% from (±)-8.
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