A process 2 wherein said {TAIL ~ ring closure} is conducted using p toluenesulfonic acid or an ester or p toluenesulfonyl halide with {HEAD ~ a tertiary amine} 
A process 2 wherein said { TAIL ~ ring closure } is conducted using p toluenesulfonic acid or an ester or p toluenesulfonyl halide with { HEAD ~ a tertiary amine }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD