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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: Sci China Chem. 2011 Jan;54(1):117–128. doi: 10.1007/s11426-010-4175-9

Scheme 1.

Scheme 1

Reagents and yields: (a) (i) NaOMe, MeOH; (ii) PhCH(OMe)2, CSA, DMF, 87%; (b) TMSOTf, CH2Cl2, 53%; (c) (i) Pd/C, H2; (ii) NaN3, TBAI, DMF, 95%; (d) (i) N2H4-H2O, EtOH; (ii) Ac2O, pyridine; (iii) NaOMe, MeOH, 84%.