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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 3.

Scheme 3

Reagents and yields: (a) (i) AcCl, 3-chloro-1-propanol; (ii) PhCH(OMe)2, CSA, DMF, 17:21%; 18: 57%; (b) 9, TMSOTf, CH2Cl2, 19:62%; 20: 48%; (c) (i) NaN3, TBAI, DMF; (ii) 80% HOAc, 21:94%; 22: 91%; (d) (i) N2H4-H2O, EtOH; (ii) Ac2O, pyridine; (iii) NaOMe, MeOH, 4:85%; 5: 76%.