已经制备了2-烯丙氧基链烷酸(1)和丙-2-炔氧基乙酸的酰肼(3)和(4)。然后,通过与苯甲酰氯反应,将这些酰肼分别转化为the(6)和(7)。通过与碳酸钠反应,由生成了偶氮烯烃。分离的产物是由偶氮烯烃的自发分子内环加成反应形成的哒嗪-恶嗪酮(8)[来自(6)]和(9)[来自(7)]。(6b)和(6c)具有不相邻于羰基的不对称碳中心的化合物各自产生非对映异构的恶嗪的混合物,但是在每种情况下具有相当大的选择性(6:1)。这归因于过渡态中的空间效应。用衍生自酰肼(3)和(4)的和溴代丙酮酸乙酯进行了一系列类似的转化。还已经制备了N-乙酰基-N-烯丙基甘氨酸酰肼(11)。通过与碳酸钠反应,将由该酰肼和苯甲酰氯形成的hydr (13)转化为偶氮烯,将其环化,得到吡嗪并[1,2 - b ]哒嗪-8-一(14a)。)。
Synthesis of Functionalized 2,3- and 3,4-Dihydropyrans Starting from α-Hydroxycarboxylic Esters <i>via</i> RCM
作者:Bernd Schmidt、Holger Wildemann
DOI:10.1055/s-1999-2884
日期:——
α-Hydroxy carboxylic acids and their derivatives are naturally occurring starting materials for the synthesis of functionalized tetrahydropyrans using ring closing metathesis and base induced epoxide rearrangement as key steps. (S)-Lactic acid methyl ester has been used as the starting material for the preparation of enantiomerically pure 6-desoxy C-glycoside precursors.
The present invention is directed to pyrazolo[4,3-c]cinnolin-3-one compounds of formula (I) which are M1 receptor positive allosteric modulators and that are useful in the treatment of diseases in which the M1 receptor is involved, such as Alzheimer's disease, schizophrenia, pain or sleep disorders. The invention is also directed to pharmaceutical compositions comprising the compounds, and to the use of the compounds and compositions in the treatment of diseases mediated by the M1 receptor.
The present invention is directed to pyrazolo[4,3-c]cinnolin-3-one compounds of formula (I)
which are M1 receptor positive allosteric modulators and that are useful in the treatment of diseases in which the M1 receptor is involved, such as Alzheimer's disease, schizophrenia, pain or sleep disorders. The invention is also directed to pharmaceutical compositions comprising the compounds, and to the use of the compounds and compositions in the treatment of diseases mediated by the M1 receptor.
The present invention is directed to pyrazolo[4,3-c]cinnolin-3-one compounds of formula (I) which are M1 receptor positive allosteric modulators and that are useful in the treatment of diseases in which the M1 receptor is involved, such as Alzheimer's disease, schizophrenia, pain or sleep disorders. The invention is also directed to pharmaceutical compositions comprising the compounds, and to the use of the compounds and compositions in the treatment of diseases mediated by the M1 receptor.
The present invention is directed to pyrazolo[4,3-c]cinnolin-3-one compounds of formula (I)
which are M1 receptor positive allosteric modulators and that are useful in the treatment of diseases in which the M1 receptor is involved, such as Alzheimer's disease, schizophrenia, pain or sleep disorders. The invention is also directed to pharmaceutical compositions comprising the compounds, and to the use of the compounds and compositions in the treatment of diseases mediated by the M1 receptor.