申请人:Bayer Aktiengesellschaft
公开号:US04616084A1
公开(公告)日:1986-10-07
A process for the preparation of a 7-acylamino-3-hydroxy-2-cephem-4-carboxylic acid, 7-acylamino-3-hydroxy-1-dethia-1-oxa-3-cephem-4-carboxylic acid or derivative thereof of the general formula ##STR1## in which R.sup.1 is hydrogen or optionally substituted alkyl, alkenyl, alkinyl, aralkyl, aryl, heteroaryl, heteroaralkyl, aryloxyalkyl, heteroaryloxyalkyl, alkoxyalkyl, arylthioalkyl, heteroarylthioalkyl, alkylthioalkyl, alkoxy, aryloxy, alkylthio or arylthio, R.sup.2 is hydrogen, a carboxy-protective group or a pharmaceutically useful ester radical, and X is sulphur or oxygen, which comprises: (a) reacting a compound of the formula ##STR2## with (i) a compound of the formula ##STR3## in which R.sup.2 and X have the abovementioned meaning and Y represents diazo (N.sub.2) or hydrogen (H.sub.2) in an inert solvent in the presence of a Lewis acid or proton acid catalyst, or (ii) a compound of the formula HX--CH.sub.2 --C.tbd.C--COOR.sup.2 to form an intemediate compound having a triple bond, and hydrating the triple bond, the compounds thus obtained, for Y being hydrogen (H.sub.2)--(in case of Y=diazo (N.sub.2) directly the compounds of general formula (2) are obtained) thereby to produce a compound of the formula ##STR4## (b) reacting such compound with an azide in a solvent in the presence of a base to give a compound of the formula ##STR5## (c) converting said compound to the desired product by (i) irradiation in an inert solvent, or (ii) warming in the presence of a catalyst. The end products are, or can be converted to, known .beta.-lactam antibiotics.
一种制备7-酰化氨基-3-羟基-2-头孢烯-4-羧酸,7-酰化氨基-3-羟基-1-去硫-1-氧-3-头孢烯-4-羧酸或其衍生物的方法,其通式为##STR1##其中R.sup.1是氢或可选取代的烷基,烯基,炔基,芳基烷基,芳基,杂芳基,杂芳基烷基,芳氧基烷基,杂芳氧基烷基,烷氧基烷基,芳硫基烷基,杂芳硫基烷基,烷硫基烷基,烷氧基,芳氧基,烷硫基或芳硫基,R.sup.2是氢,羧保护基或药用酯基,X是硫或氧,包括以下步骤:(a)在惰性溶剂中,在路易斯酸或质子酸催化剂的存在下,将式##STR2##的化合物与(i)式##STR3##的化合物反应,其中R.sup.2和X具有上述含义,Y代表重氮(N.sub.2)或氢(H.sub.2),或(ii)式HX-CH.sub.2-C.tbd.C-COOR.sup.2的化合物形成三键中间体,加水合成三键,从而得到通式(2)的化合物,其中Y为氢(H.sub.2)时,直接得到通式(2)的化合物,即##STR4##(b)在碱的存在下,在溶剂中与叠氮化物反应,得到式##STR5##的化合物,(c)通过(i)在惰性溶剂中辐射或(ii)在催化剂存在下加热,将该化合物转化为所需的产物。最终产物是已知的β-内酰胺类抗生素,或可以转化为其。