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. Author manuscript; available in PMC: 2007 May 3.
Published in final edited form as: Tetrahedron Lett. 2007 Apr 2;48(14):2533–2536. doi: 10.1016/j.tetlet.2007.02.016

Scheme 4.

Scheme 4

Reagents and C onditions: (a) Boc2O, Et3N, DMAP, THF; (b) TBAF, AcOH, DMF; (c) Cs2CO3, MeOH; (d) PhCH(OMe)2, CSA, CH2Cl2; (e) KOtBu, MeI, THF; (f) PhBCl2, Et3SiH, 4Å, CH2Cl2