α-异氰基丙酸乙酯 (I) 热环化生成 5-乙氧基-4-甲基恶唑 (II) 作为合成吡哆醇的中间体。也进行了几种新的α-异氰基羧酸烷基酯与相应的5-烷氧基-4-取代的恶唑的类似反应。研究了I的热环化反应产物。180℃环化5小时,主产物II的最大收率为20%;还得到了未反应的 I (30%)、α-氰基丙酸乙酯 (20%) 和 I 的二聚体 (5%)。α-异氰基琥珀酸乙酯 (X) 的 α-氢比 I 更容易去除,因此可以预期 X 更容易转化为 5-乙氧基-4-乙氧基羰基甲基恶唑 (XI),它也是吡哆醇。
Hydronopol derivatives as agonists on human ORL1 receptors
申请人:Mentzel Matthias
公开号:US20050131004A1
公开(公告)日:2005-06-16
The invention relates to a group of hydronopol derivatives which are agonists on human ORL1 (nociceptin) receptors. The invention also relates to the preparation of these compounds, to pharmaceutical compositions containing a pharmacologically active amount of at least one of these novel hydronopol derivatives as an active ingredient, as well as to the use of these pharmaceutical compositions for the treatment of disorders in which ORL1 receptors are involved.
The invention relates to compounds of the general formula (1)
wherein the symbols have the meanings as given in the description.
Enantioselective cyclization of α-isocyano esters with azodicarboxylates catalyzed by FeIIâN,Nâ²-dioxide complexes has been developed. Under mild conditions, a variety of 1,2,4-triazoline derivatives was obtained in high yields and enantioselectivities.
Synthesis of [13C3]-B6 Vitamers Labelled at Three Consecutive Positions Starting from [13C3]-Propionic Acid
作者:Thomas Bachmann、Michael Rychlik
DOI:10.3390/molecules23092117
日期:——
[13C₃]-labelled vitamers (PN, PL and PM) of the B6 group were prepared starting from [13C₃]-propionic acid. [13C₃]-PN was synthesized in ten linear steps with an overall yield of 17%. Hereby, higher alkyl homologues of involved esters showed a positive impact on the reaction outcome of the intermediates in the chosen synthetic route. Oxidation of [13C₃]-PN to [13C₃]-PL was undertaken using potassium
从[13C 6]-丙酸开始制备B 6组的[13 C 16]标记的维生素(PN,PL和PM)。以十个线性步骤合成了[13 C 18] -PN,总产率为17%。因此,所涉及的酯的更高的烷基同系物对所选合成途径中的中间体的反应结果显示出积极的影响。用高锰酸钾和甲胺将[13C 4] -PN氧化为[13 C 8] -PL,然后酸水解亚胺衍生物。可以通过用钯氢化由[13C 6] -PN的肟衍生物制备[13 C 8] -PM。