proxorphan proxorphan proxorphan (inn), also known as proxorphan tartate (usan) (developmental code name bl-5572m), is an opioid analgesic and antitussive drug of the morphinan family that was never marketed. it acts preferentially as a κ-opioid receptor partial agonist and to a lesser extent as a μ-opioid receptor partial agonist. proxorphanclinical dataatc codenoneidentifiers iupac name 17-(cyclopropylmethyl)-6-oxamorphinan-3-olor(1s,9r,10r)-17-(cyclopropylmethyl)-13-oxa-17-azatetracycloheptadeca-2,4,6-trien-4-ol cas number69815-38-9pubchem cid5361874chemspider21476727uniitfe8t279qvcomptox dashboard (epa)dtxsid90990082 chemical and physical dataformulac19h25no2molar mass299.414 g·mol−13d model (jsmol)interactive image smiles c1cc2c(cc1o)c34ccn(c(c2)c3ccoc4)cc5cc5 synthesis t. a. montzka, j. d. matiskella and r. a. partyka, u.s. patent 4,246,413; chem. abstr. 95, 43442z (1981). starting material for this preparation is ketoester 1, available by one of the classical benzomorphan syntheses. condensation with the ylide from triethyl phosphonoacetate (hwe reaction) affords diester 2. catalytic hydrogenation proceeds from the less hindered face to afford the corresponding saturated diester (3). the esters are then reduced by means of lialh4 to give the glycol (4); this undergoes internal ether formation on treatment with acid to form the pyran ring of 5. von braun reaction with brcn (or ethyl chloroformate) followed by saponification of the intermediate leads to the 2° amine (6). this is converted to the cyclopropylmethyl derivative 8 by acylation with cyclopropylcarbonyl chloride followed by reduction of the thus formed amide (7) with lialh4. cleaving off the o-methyl ether with sodium ethanethiol affords proxorphan (9).