申请人:Bayer Aktiengesellschaft
公开号:US03940390A1
公开(公告)日:1976-02-24
2, 3, 4, 5, 6, 7-HEXAHYDROCYCLOPENTA-[E]-1,3-OXAZINE-2,4-DIONE COMPOUNDS ARE PRODUCED BY REACTING AN ADIPIC ACID HALIDE OF THE FORMULA ##EQU1## wherein R is hydrogen or alkyl of up to 3 carbons; and X is halogen, preferably chlorine or bromine, With an isocyanate of the formula O=C=N--R.sup.1 in which R.sup.1 is hydrocarbyl or substituted hydrocarbyl, preferably of less than 11 carbons. The process is conducted in the presence of a tertiary base, and optionally in the presence of a solvent, at a temperature of from 80.degree. to 180.degree.C., preferably at from 90.degree. to 130.degree.C.
2, 3, 4, 5, 6, 7-六氢环戊-[E]-1,3-噁嗪-2,4-二酮化合物是通过将化学式为##EQU1##的己二酸酰卤(其中R为氢或碳原子数最多为3的烷基;X为卤素,优选氯或溴)与化学式为O=C=N--R.sup.1的异氰酸酯(其中R.sup.1为烃基或取代烃基,优选碳原子数少于11)反应而制备的。该过程在三级碱的存在下进行,可选地在溶剂的存在下,在80°C至180°C的温度下进行,优选在90°C至130°C进行。