{HEAD ~ The process} employing a non chiral auxiliary in the starting material can employ either a fluoride ion catalyst or {TAIL ~ a salt} of a chiral or non chiral auxiliary for cyclization 
{ HEAD ~ The process } employing a non chiral auxiliary in the starting material can employ either a fluoride ion catalyst or { TAIL ~ a salt } of a chiral or non chiral auxiliary for cyclization
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH