{HEAD ~ Reduction} of {TAIL ~ lactones} 1, which were prepared by the previously disclosed methods , with DIBAL H followed by acid catalyzed methylation provides lactal intermediates 2 
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{ HEAD ~ Reduction } of { TAIL ~ lactones } 1 , which were prepared by the previously disclosed methods , with DIBAL H followed by acid catalyzed methylation provides lactal intermediates 2
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH