申请人:Sumitomo Chemical Company, Limited
公开号:US04424389A1
公开(公告)日:1984-01-03
A process for producing chroman, a compound of the formula, ##STR1## or an optically active compound thereof wherein R.sub.2, R.sub.3 and R.sub.4 are each a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, which comprises reacting a compound of the formula, ##STR2## or an optically active compound thereof wherein A is an aryl group and R.sub.5 is a C.sub.1 -C.sub.4 alkyl group, with a compound of the formula, ##STR3## wherein R.sub.1 is a C.sub.1 -C.sub.3 alkyl group, X is a halogen atom and R.sub.2, R.sub.3 and R.sub.4 are as defined above, to obtain a compound of the formula, ##STR4## or an optically active compound thereof wherein A, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined above, reacting the resulting compound with methylmagnesium halide and then hydrolyzing to obtain the corresponding 4-aryl substituted 2-hydroxy-2-methylbutanal, or an optically active compound thereof, reducing the resulting compound to obtain a diol, or an optically active compound thereof, and then oxidizing the resulting compound to obtain a compound of the formula, ##STR5## or an optically active compound thereof wherein R.sub.2, R.sub.3 and R.sub.4 are as defined above, followed by reduction. Chromans, the objective compounds of this invention, are an intermediate for the synthesis of tocopherols, particularly .alpha.-tocopherol.
一种生产香豆素的方法,该化合物的式子为##STR1##或其手性活性化合物,其中R.sub.2,R.sub.3和R.sub.4均为氢原子或C.sub.1-C.sub.4烷基;包括将式子##STR2##或其手性活性化合物与式子##STR3##反应,其中A为芳基且R.sub.5为C.sub.1-C.sub.4烷基,R.sub.1为C.sub.1-C.sub.3烷基,X为卤原子,R.sub.2,R.sub.3和R.sub.4如上定义,以获得式子##STR4##或其手性活性化合物,其中A,R.sub.1,R.sub.2,R.sub.3和R.sub.4如上定义,然后将所得化合物与甲基镁卤反应,然后水解以获得相应的4-芳基取代的2-羟基-2-甲基丁醛,或其手性活性化合物,还原所得化合物以获得二醇,或其手性活性化合物,然后氧化所得化合物以获得式子##STR5##或其手性活性化合物,其中R.sub.2,R.sub.3和R.sub.4如上定义,最后还原。香豆素是本发明的目标化合物,是合成生育酚特别是α-生育酚的中间体。