Asymmetric synthesis of .beta.-amino alcohols from chiral or achiral
enamines
    1.
    发明授权
    Asymmetric synthesis of .beta.-amino alcohols from chiral or achiral enamines 失效
    手性或非手性烯胺对β-氨基醇的不对称合成

    公开(公告)号:US5367073A

    公开(公告)日:1994-11-22

    申请号:US138613

    申请日:1993-10-15

    摘要: The present invention relates to a process for the synthesis of chiral enantiomerically pure .beta.-amino alcohols which are extraordinarily important as therapeutic agents for the treatment of a variety of human disorders and as chiral auxiliaries in organic synthesis. The hydroboration of enamines is a versatile and convenient method for the synthesis of both racemic and enantiomerically pure .beta.-amino alcohols in high yields. This methodology enables the synthesis of virtually any .beta.-amino alcohol. Hydroboration of these enamines with chiral organic borohydrides, e.g. either mono- or diisopinocampheylborane, followed by oxidation with aqueous or solid NaOH/30% H.sub.2 O.sub.2 or Me.sub.3 NO, gives the corresponding chiral .beta.-amino alcohol. Enantiomeric excesses ranged from 60% for reactions run at 25.degree. C. to greater than 99% for reactions run at -25.degree. C.

    摘要翻译: 本发明涉及合成手性对映异构纯的β-氨基醇的方法,其作为用于治疗多种人类疾病的治疗剂非常重要,并且作为有机合成中的手性助剂。 烯胺的硼氢化合物是以高产率合成外消旋和对映异构纯的β-氨基醇的通用和方便的方法。 该方法使得几乎可以合成任何β-氨基醇。 这些烯胺与手性有机硼氢化物的水解,例如 单或二蒎烷基硼烷,然后用水或固体NaOH / 30%H 2 O 2或Me 3 NO 3氧化,得到相应的手性β-氨基醇。 在25℃下进行的反应,对映异构体的过量范围为60%,对于在-25℃下进行的反应为大于99%

    Synthesis of lithium aminoborohydrides and reactions thereof
    2.
    发明授权
    Synthesis of lithium aminoborohydrides and reactions thereof 失效
    氨基硼氢化锂的合成及其反应

    公开(公告)号:US5466798A

    公开(公告)日:1995-11-14

    申请号:US138612

    申请日:1993-10-15

    摘要: The present invention relates to novel, powerful reducing agents, lithium aminoborohydrides which are prepared by addition of BH.sub.3 .cndot.THF to the corresponding dialkylamine at 25.degree. C. to give the intermediate amineborane complex. Subsequent deprotonation by strong base, e.g. n-BuLi, yields the aminoborohydride quantitatively. Lithium aminoborohydrides are powerful reducing agents, comparable in strength to lithium aluminum hydride. The activity is determined by the dialkylamine. Lithium pyrrolidinoborohydride has unique activity and selectivity in its reducing properties. Esters, lactones and anhydrides are reduced cleanly at 25.degree. C. to give the corresponding alcohols, while carboxylic acids are not reduced. Test reductions show that lithium pyrrolidinoborohydride is also capable of reducing a wide range of functional groups including amides, epoxides, oximes, nitriles and halides.

    摘要翻译: 本发明涉及通过在25℃下向相应的二烷基胺中加入BH3.THF而制得的新的强大的还原剂氨基硼酸锂,得到中间体胺硼烷络合物。 随后通过强碱去质子化,例如 n-BuLi,定量产生氨基硼氢化钠。 氨基硼氢化锂是强大的还原剂,其强度与氢化铝锂相当。 活性由二烷基胺决定。 吡咯烷基硼氢化锂在还原性能方面具有独特的活性和选择性。 酯,内酯和酸酐在25℃下干净地还原,得到相应的醇,而羧酸不被还原。 测试减少表明,吡咯烷基硼氢化锂还能够减少宽范围的官能团,包括酰胺,环氧化物,肟,腈和卤化物。