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. Author manuscript; available in PMC: 2008 Dec 7.
Published in final edited form as: J Org Chem. 2007 Nov 3;72(25):9722–9731. doi: 10.1021/jo7017922

Scheme 17.

Scheme 17

Crotylation of 26 with E and Z-Crotylsilane.

a: 4.0 equiv SnBr4, CH2Cl2, −78 °C to - 35 °C, 24 h, 65%; b: 1) Dess-Martin [O], 96%; 2) NaH2PO4, NaClO2, t-BuOH/H2O, 2-Me-2-butene, 85%; 3) Separation of 51a and 51b.