A process is disclosed for the preparation of a compound of the formula (XI) ##STR1## or a salt thereof, wherein R.sup.1 is hydrogen, halogen, C.sub.1 to C.sub.4 alkyl, C.sub.1 to C.sub.3 alkoxy, or trifluoromethyl; R.sup.5 is amino or C.sub.1 to C.sub.4 alkoxycarbonylamino; and R.sup.4" is C.sub.1 to C.sub.6 alkyl, C.sub.2 to C.sub.6 alkenyl, C.sub.2 to C.sub.6 alkynyl, cyclohexyl, benzyl, or 2-phenyl-ethyl, which comprises the steps of: (a) reacting a compound of the formula (VIII) ##STR2## or a salt thereof, with a basic nucleophilic compound to yield a salt of the formula (IX) ##STR3## wherein R.sup.4' is a lone pair of electrons, in which case an alkali metal or alkali earth metal cation forms a salt with the sulfur atom; and (b) reacting a salt of the formula (IX) with a compound of the formula (X) R.sup.4' --Q wherein Q is hydroxyl, halogen, 1/2SO.sub.4, 1/3PO.sub.3, SO.sub.3 C.sub.6 H.sub.5, or SO.sub.3 C.sub.6 H.sub.4 CH.sub.3 to yield the desired product.
本发明公开了一种制备化合物(XI)的方法,其中R1为氢、卤素、C1至C4烷基、C1至C3烷氧基或三
氟甲基;R5为
氨基或C1至C4烷氧羰基
氨基;R4"为C1至C6烷基、C2至C6烯基、C2至C6炔基、环己基、苄基或2-苯乙基。该方法包括以下步骤:(a)将化合物(VIII)或其盐与碱性亲核化合物反应,得到公式(IX)的盐,其中R4'为孤对电子,在这种情况下,碱
金属或碱土
金属阳离子与
硫原子形成盐;(b)将公式(IX)的盐与公式(X)的化合物R4'-Q反应,其中Q为羟基、卤素、1/2SO4、1/3PO3、SO3C6H5或SO3C6H4CH3,以得到所需的产物。