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