Reduction of cis-3-cyano-4-hydroxypiperidines with lithium aluminum hydride (LAH) gave cis-3-aminomethyl-4-hydroxypiperidines, which were converted to cis-3-dimethylaminomethyl-4-hydroxypiperidines by methylation with formaldehyde and formic acid. Acylation of the methylated compounds with benzoyl and cinnatnoyl chlorides gave the corresponding esters. Condensation of cis-3-aminomethyl-4-hydroxypiperidines with formaldehyde gave perhydropyrido[3,4-e][1,3]oxazines, which were converted to 3-methylaminomethyl-4-hydroxypiperidines by means of LAH. The cis isomers of the corresponding O,N-diacyl derivatives of these amino alcohols were obtained by acylation with acetic anhydride and benzoyl and cinnamoyl chlorides.