申请人:Bayer Aktiengesellschaft
公开号:US04808725A1
公开(公告)日:1989-02-28
A process for the preparation of the (-)-antipode of (E)-1-cyclohexyl-4,4-dimethyl-3-hydroxy-2-(1,2,4-triazol-1-yl)-pent-1-ene of the formula ##STR1## which comprises reacting the (E)-isomer of 1-cyclohexyl-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-pent-1-en-3-one of the formula ##STR2## (a) with boron hydride in the presence of an optically active proline derivative of the formula ##STR3## in which, R.sup.1 is alkyl, phenyl or benzyl, or (b) with a complex borohydride in the presence of an acid addition salt of the optically active proline derivative, in the presence of a diluent at a temperature between about -70.degree. C. and +60.degree. C. The proline derivatives are also new and are produced from S-proline esters. The end product is a known plant growth regulant.
一种制备式为##STR1##的(E)-1-环己基-4,4-二甲基-3-羟基-2-(1,2,4-三唑-1-基)-戊-1-烯的(-)-对映体的方法,包括将式为##STR2##的(E)-1-环己基-4,4-二甲基-2-(1,2,4-三唑-1-基)-戊-1-烯-3-酮与硼氢化钠在光学活性脯氨酸衍生物##STR3##的存在下反应(a),其中R.sup.1是烷基、苯基或苄基,或者与光学活性脯氨酸衍生物的酸加盐复合硼氢化物在稀释剂存在下反应(b),在温度约为-70℃至+60℃之间。脯氨酸衍生物也是新的,并且是由S-脯氨酸酯制备的。最终产品是已知的植物生长调节剂。