The present invention relates to a new synthesis for the preparation of 5-(substituted benzyl)-2,4-diamino-pyrimidines, including new pyrimidine derivatives. More particularly, a new synthesis of ormetoprin, diaveridine and related compounds, including novel derivatives, is disclosed. The synthesis involves the condensation of a substituted benzene and an acrylonitrile derivative to directly give enol ether intermediates, which upon subsequent reaction by known techniques with guanidine, provides the desired 5-(substituted benzyl)-2,4-diamino-pyrimidines, including novel compounds. The pyrimidine end products are useful as potentiators of sulfonamides and as antibacterial agents.
A process for the preparation of a .beta.-alkoxyacrylonitrile of the formula where R is hydrogen or an alkyl moiety, among others, by contacting a compound of the formula where Me is an alkali metal or alkaline earth metal and .alpha. is 1 or 2 respectively, an elevated temperature with a halogen compound of the formula where R' is among others a straight or branched alkyl or alkenyl moiety and Hal represents chlorine, bromine, or iodine. Also disclosed is a process for preparing a 3-amino-acrylonitrile of the formula ##STR1## where R.sup.5 and R.sup.6 represent, among others, hydrogen, alkyl or alkenyl by contacting a 3-alkoxyacrylonitrile or a metal salt of 3-hydroxyacrylonitrile with ammonia and/or amine. Also disclosed is a process for the preparation of such 3-aminoacrylonitrile by contacting a 3-alkoxyacrylonitrile of the formula ##STR2## where R' has the meaning given above and R.sup.7 has the same meaning as R stated above with an amine of the formula ##STR3## wherein R.sup.5 and R.sup.6 represent among others hydrogen, alkyl or alkenyl. The application further discloses a process for preparing a 3-amino-acrylonitrile of the formula ##STR4## where R.sup.5, R.sup.6 and R.sup.7 have the above meanings by contacting a compound of the formula ##EQU1## with an amine. The Application also discloses the preparation of two-cyanovinyl esters by reaction of a cyanovinyl compound of the formula ##EQU2## with an acid halide or an acid anhydride.
Compounds and methods for treating diseases mediated by a P2X.sub.3 and/or a P2X.sub.2/3 receptor antagonist, the methods comprising administering to a subject in need thereof an effective amount of a compound of formula (I): ##STR00001## wherein D, X, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are as defined herein.
