amide comprises a deprotonated chiral auxiliary as defined above in can alternatively be used with a non chiral auxiliary, i.e., an auxiliary as defined above wherein {TAIL ~ each} of R12 and R13 are {HEAD ~ hydrogen} 
amide comprises a deprotonated chiral auxiliary as defined above in can alternatively be used with a non chiral auxiliary , i.e. , an auxiliary as defined above wherein { TAIL ~ each } of R12 and R13 are { HEAD ~ hydrogen }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD