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