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. Author manuscript; available in PMC: 2011 Feb 17.
Published in final edited form as: J Am Chem Soc. 2010 Feb 17;132(6):1802–1803. doi: 10.1021/ja910831k

Scheme 2a.

Scheme 2a

aReagents and conditions: (a) n-BuLi, THF, −78 °C; AllylOCOCl, 90%; (b) (Me2N)2C=NH2N3, CHCl3, 23 °C, 69% (2:1, E:Z); (c) PPh3, CH2Cl2, 23 °C; add TBSOCH2N=C=O, PhH, 80 °C, 49% from (E)-13, 43% from (Z)-13.