会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 4. 发明授权
    • Synthesis of methylphenidate and analogs thereof
    • 哌甲酯及其类似物的合成
    • US08283472B2
    • 2012-10-09
    • US12652894
    • 2010-01-06
    • Joseph P. Haar, Jr.Carl J. SchaeferCharles S. Kuivila
    • Joseph P. Haar, Jr.Carl J. SchaeferCharles S. Kuivila
    • C07D211/34
    • C07D211/60
    • A synthetic process for the preparation of amino acid esters such as methylphenidate and analogs thereof is disclosed. The process involves reacting an amino acid such as α-phenyl-α-(2-piperidinyl)acetic acid or an analog thereof with an alcohol such as methanol in the presence of an acid and a water sequestrant such as trimethyl orthoacetate. In some embodiments, the water sequestrant is added to the reaction mixture after an initial period of esterification and then the reaction is allowed to continue. The α-phenyl-α-(2-piperidinyl)acetic acid methyl ester or analog thereof is then isolated from the reaction mixture. In one variation of the process, the supernatant liquid may be recycled in subsequent runs to increase yield and product purity.
    • 公开了用于制备氨基酸酯如哌甲酯及其类似物的合成方法。 该方法包括在酸和水多价螯合剂如原乙酸三甲酯存在下使氨基酸如α-苯基-α-(2-哌啶基)乙酸或其类似物与醇如甲醇反应。 在一些实施方案中,在酯化的初始阶段之后,将水螯合剂加入到反应混合物中,然后使反应继续进行。 然后从反应混合物中分离α-苯基-α-(2-哌啶基)乙酸甲酯或其类似物。 在该方法的一个变化方案中,上清液可以在随后的运行中再循环以提高产率和产物纯度。
    • 7. 发明授权
    • Super-absorbing polymeric networks
    • 超吸收聚合物网络
    • US5998492A
    • 1999-12-07
    • US178963
    • 1998-10-26
    • Joseph P. Haar, Jr.Robert J. Ross
    • Joseph P. Haar, Jr.Robert J. Ross
    • A61L15/60C08G73/10C08J9/28
    • C08J9/28A61L15/60C08G73/1092C08J2377/04
    • Disclosed are methods of producing super-absorbing polymeric networks of polyaspartates from crosslinked polysuccinimide. In one preferred aspect, polysuccinimide is first reacted with an organic crosslinking agent, preferably an organic base containing at least two primary amine groups, to form a gelled crosslinked polysuccinimide. The gelled crosslinked polysuccinimide is then base hydrolyzed to a gelled polymeric network of polyaspartate and deswollen with at least one liquid alcohol to a polymeric network of polyaspartate which demonstrates super-absorbing capability in water and in electrolyte solution. Super-absorbing polymeric networks of polyaspartates can also be produced in a single reaction vessel by sequentially crosslinking a polysuccinimide with an organic crosslinking agent in an aqueous reaction medium, optionally containing a mineral acid, and then hydrolyzing the crosslinked polysuccinimide to produce a polymeric network of polyaspartate.
    • 公开了从交联聚琥珀酰亚胺生产聚天冬氨酸的超吸收聚合物网络的方法。 在一个优选的方面,首先将聚琥珀酰亚胺与有机交联剂,优选含有至少两个伯胺基团的有机碱反应,以形成凝胶状交联的聚琥珀酰亚胺。 然后将凝胶状交联的聚琥珀酰亚胺碱基水解成聚天冬氨酸的凝胶聚合物网络,并用至少一种液态醇解聚到聚天冬氨酸的聚合物网络,其在水和电解质溶液中表现出超吸收能力。 聚天冬氨酸的超吸收聚合物网络也可以通过在含水无机酸的水性反应介质中依次使聚琥珀酰亚胺与有机交联剂交联,然后水解交联聚琥珀酰亚胺以产生聚 聚天冬氨酸