申请人:Daicel Chemical Industries Ltd.
公开号:US04739083A1
公开(公告)日:1988-04-19
A new process for preparing a pyrone-3-carboxamide compound of the formula (IV): ##STR1## wherein R.sub.1 is aryl or heterocyclic group optionally substituted, R.sub.2 is alkyl, aralkyl or like group, comprising reacting a compound of the formula (I) or (I'): ##STR2## wherein R.sub.3 is dialkylamino group and n is 0 to 6, and R.sub.1 and R.sub.2 are as above, with a compound of the formula (II): ##STR3## wherein R.sub.4 and R.sub.5 are hydrogen atom, alkyl or like group, or reacting a compound of the formula (III): ##STR4## wherein R.sub.6 is alkyl, aryl or like group, and R.sub.1 and R.sub.2 are as above, with a compound of the formula (II) or diketene in the presence of a tertiary organic base.
一种制备式(IV)的吡喃酮-3-羧酰胺化合物的新工艺,其中R1为芳基或杂环基,可选地取代,R2为烷基、芳基烷基或类似基团,包括将式(I)或(I')的化合物:其中R3为二烷基氨基团,n为0至6,R1和R2如上所述,与式(II)的化合物反应:其中R4和R5为氢原子、烷基或类似基团,或将式(III)的化合物:其中R6为烷基、芳基或类似基团,R1和R2如上所述,与式(II)或二酮在三级有机碱的存在下反应。