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. Author manuscript; available in PMC: 2008 Dec 11.
Published in final edited form as: Heterocycles. 2006 Dec 31;70:557–570. doi: 10.3987/com-06-s(w)16

Scheme 3.

Scheme 3

Reagents and conditions: (a) SESCl, NaH, THF, 0 °C (66%); (b) NH3, CH3OH, 0→23 °C (92%); (c) DIBAL, THF, –78→0 °C (47%); (d) MbsCl, NaH, THF, 0 °C (89%); (e) NaBH4, CH3OH, 0 °C (100%). (SES = 2-(trimethylsilyl)ethylsulfonyl; Mbs = 4-methoxybenzenesulfonyl.)