In the process, an alkyl β alkoxy β iminopropionate salt is reacted first with a suitable alkanol to form {HEAD ~ an orthoester} intermediate in {TAIL ~ situ} 
In the process , an alkyl β alkoxy β iminopropionate salt is reacted first with a suitable alkanol to form { HEAD ~ an orthoester } intermediate in { TAIL ~ situ }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL