Of cyclohexylamine with ethyl formate

Cyclohexene, conversion to cyclopen-tanecarboxaldehyde, 44, 26 purification of, 41, 74 reaction with zinc-copper couple and methylene iodide, 41, 73 Cyclohexene oxide, 44, 29 2-Cyclohexenone, 40,14 Cyclohexylamine, reaction with ethyl formate, 41,14... 

The reactions of ethyl 2,4-dimethylpyrrole-3-carboxylate with a number of primary amines and an excess of formaldehyde lead to the formation of 2,3-dihydro-l//-imidazo[l,5-a]pyrroles. The reaction of cyclohexylamine, which, as indicated in the foregoing section, would not be expected to yield a product involving two pyrrole nuclei, does result in the formation of the dihydroimidazopyrrole in 70% yield as shown in Scheme 6. ... 

The conversion of symmetrical into unsymmetrical thioureas is exemplified by the formation of Af-cyclohexyl-Af -phenylthiourea when yV,iV-diphenyl thiourea is heated with cyclohexylamine and triethylamine in acetonitrile367. Carbonylation of lithium piperidide in the presence of tellurium generates the lithium carbamotellurate 307, which is trapped as the 7V-ethyl carbamotellurate 308 by ethyl bromide368. 

---