Also, {HEAD ~ a salt} of a non chiral auxiliary can be used as {TAIL ~ a cyclizing agent} in a process using a starting material containing a chiral auxiliary 
Also , { HEAD ~ a salt } of a non chiral auxiliary can be used as { TAIL ~ a cyclizing agent } in a process using a starting material containing a chiral auxiliary
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH