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. Author manuscript; available in PMC: 2010 Jul 2.
Published in final edited form as: Tetrahedron. 2009 Jun 27;65(26):4957–4967. doi: 10.1016/j.tet.2009.03.103

Scheme 6.

Scheme 6

Preparation of aldehyde 34 for NHC-catalyzed intramolecular cyclization-lactonization. (DIPEA=N,N-diisopropylethylamine, Dess-Martin= 1,1,1-triacetoxy-1,1-dihydro-1,2-benziodoxol-3 (1 H)-one, PMB=p-methoxybenzyl).