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