The invention concerns a novel press for the racemisation of unwanted enantiomeric forms of 1 min -substituted spiro[imidazolidine-4,3 min -indoline]-2,2 min ,5-triones and 1 min -substituted spiro[pyrrolidine-3,3 min -indoline]-2,2 min ,5-triones which comprises heating an unwanted enantiomeric form (or a mixture containing an excess of one enantiomer over the other) alone or, more conveniently, in the presence of a solvent or diluent at a temperature in the range 80 to 280 DEG C. CHEM c
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机译:本发明涉及一种新颖的压力机,用于消灭不需要的对映体形式的1分钟取代的螺[咪唑烷-4,3分钟-二氢吲哚] -2,2分钟,5-三酮和1分钟取代的螺[吡咯烷-3,3 [min-indoline] -2,2 min,5-triones,该方法包括单独加热一种不需要的对映体形式(或比另一种对映体含有过量一种对映体的混合物),或者更方便地,在溶剂或稀释剂存在下于温度范围为80到280℃。 c
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