The addition of metallic sodium is added to a mixture of
allyl alcohol (1) and N,N-
dibutylamine (2) gives the conjugate addition product and hence 3-dibutylamino-1-propanol [2050-51-3] (3). Esterification of this intermediate with para-nitrobenzoyl chloride [122-04-3] (4) gives
CID:4588466 (5). The reduction of the nitro group completed the synthesis of butacaine (6).
^Burnett, W. B.; Jenkins, R. L.; Peet, C. H.; Dreger, E. E.; Adams, Roger (1937). "Dialkylaminoalkanol Esters of p-Aminobenzoic Acid". Journal of the American Chemical Society 59 (11): 2248–2252. doi:10.1021/ja01290a041.
^Kaye, Irving Allan; Roberts, I. Melville (1951). "Dialkylaminoalkyl Esters of 2-Amino-6-carboxybenzothiazole". Journal of the American Chemical Society 73 (10): 4762–4764. doi:10.1021/ja01154a084.
^Oliver Kamm, Roger Adams, Volwiler Ernest H., U.S. patent 1,358,751 (1920 to Abbott Lab).