申请人:Solvias AG
公开号:EP1151980A1
公开(公告)日:2001-11-07
A process for the halogenation of activated methylene and methine compounds with at least equimolar amounts of an electrophilic halogenation reagent, which comprises reacting said activated methylene and methine compounds in the presence of catalytic amounts of a titanium compound of the formula I or of a titanium compound of the formula IIR1TiX1X2X3R2R3TiX1X2 in which
R1 is chlorine, bromine or iodine, a substituted or unsubstituted cyclopentadienyl or indenyl, and X1, X2 and X3 are, independently of one another, chlorine, bromine or iodine, or X1, X2 and X3 are an organic sulfonate group where R1 is a substituted or unsubstituted cyclopentadienyl or indenyl;
R2 and R3 are a substituted or unsubstituted cyclopentadienyl or indenyl, R2 and R3 together are a substituted or unsubstituted and bridged or unbridged biscyclopentadienyl or bisindenyl, or R2 and R3 together are a substituted or unsubstituted 1,3-, 1,4- or 1,5-diolate, and X1 and X2 are, independently of one another, chlorine, bromine or iodine or an organic sulfonate group.
If the diolate is enantiopure, the process is enantioselective on use of racemic activated methine compounds.
一种用至少等摩尔量的亲电卤化试剂卤化活化亚甲基和亚甲基化合物的工艺,该工艺包括在催化量的式 I 钛化合物或式 IIR1TiX1X2X3R2R3TiX1X2 的钛化合物存在下使所述活化亚甲基和亚甲基化合物反应,其中
R1 是氯、溴或碘、取代或未取代的环戊二烯基或茚基,X1、X2 和 X3 相互独立地是氯、溴或碘,或 X1、X2 和 X3 是有机磺酸盐基团,其中 R1 是取代或未取代的环戊二烯基或茚基;
R2 和 R3 是取代或未取代的环戊二烯基或茚基,R2 和 R3 合在一起是取代或未取代且桥接或未桥接的双环戊二烯基或双茚基,或 R2 和 R3 合在一起是取代或未取代的 1,3-、1,4- 或 1,5 二酸酯,且 X1 和 X2 相互独立地是氯、溴或碘或有机磺酸盐基团。
如果二元酸盐是对映体纯品,则该工艺在使用外消旋活化甲烷化合物时具有对映体选择性。