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