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