申请人:Ciba-Geigy Corporation
公开号:US04013650A1
公开(公告)日:1977-03-22
Compounds of the formula ##STR1## wherein R.sub.1.sup.a represents hydrogen or an amino protective group R.sub.1.sup.A and R.sub.1.sup.b represents hydrogen or an acyl group Ac, or R.sub.1.sup.a and R.sub.1.sup.b together represent a bivalent amino protective group, and R.sub.2 represents hydroxyl or a radical R.sub.2.sup.A which together with the carbonyl grouping --C(=O)-- forms a protected carboxyl group, as well as 1-oxides thereof, and salts of such compounds with salt-forming groups, are prepared from compounds of the formula ##STR2## wherein R.sub.1.sup.a and R.sub.1.sup.b have the above mentioned meaning, R denotes an acyloxy group, R.sub.2.sup.a has the meaning of R.sub.2 or R and R.sub.2.sup.o together denote an epoxy group, from a 1-oxide thereof or a salt of such a compound, by reduction with a metal which has a normal potential of -2.4 to -0.40 volt, or an amalgam thereof, at a pH of 1 to 8, in the presence of water.
该公式的化合物为##STR1##其中R.sub.1.sup.a代表氢或氨基保护基R.sub.1.sup.A,R.sub.1.sup.b代表氢或酰基Ac,或R.sub.1.sup.a和R.sub.1.sup.b一起代表一个二价的氨基保护基,R.sub.2代表羟基或基团R.sub.2.sup.A,它与羰基团--C(=O)--一起形成受保护的羧基团,以及其1-氧化物和带有盐基团的化合物的盐,是从该公式的化合物制备而来的##STR2##其中R.sub.1.sup.a和R.sub.1.sup.b具有上述所述的含义,R表示酰氧基,R.sub.2.sup.a具有R.sub.2或R的含义,R.sub.2.sup.o与之一起表示环氧基团,通过在pH为1至8的水存在下,用具有-2.4至-0.40伏特的正常电位的金属或其汞齐还原,或其1-氧化物或这种化合物的盐。