Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... (D)- and (L)-isomers of pipecolic acid were converted into (D)- and (L)-2-piperidinemethanamine using an efficient sequence. The amino groups were selectively protected for further functionalization. ... (D)- and (L)-Isomers of pipecolic acid were converted into (D)- and ...