1,6-二取代的3,4-二氢[1]苯并噻吩并[2,3- c ]吡啶衍生物(I)是通过Bischler-Napieralski环化适当的2-(-)的N-乙酰基或N-苯甲酰基衍生物制备的5-取代的3-苯并[ b ]噻吩基)乙胺。尝试制备3,4-二氢-1-(3,4-二甲氧基苄基)[1]苯并噻吩并[2,3- c通过类似的方法,通过吡啶和其6-氯类似物,分别得到1-(3,4-二甲氧基苯甲酰基)衍生物。用硼氢化钠将3,4-二氢衍生物(I)还原为相应的1,2,3,4-四氢衍生物(II),并用钯制木炭将其脱氢为完全芳族化合物(III)。也可以通过适当的2-(5-取代的3-苯并[ b ]噻吩基)乙胺与乙醛或苯甲醛的Pictet-Spengler反应制备四氢化合物(II)。
The invention concerns compounds of formula (I): R-A-R′ wherein: A is as defined in the description; R represents a group (V), (VI), (VII) or (VIII), where E, Q, R
1
, R
2
, R
3
, v and R
4
are as defined in the description; R′ represents a —(CH
2
)t-R
5
group wherein t and R
5
are as defined in the description.
For the first time the ability of DMSO to decompose rapidly under microwaves was explored in order to perform heterocyclizations in good conditions. This modified Pictet-Spengler reaction allowed, in this case, the synthesis of rigidified melatonin analogues. (c) 2005 Elsevier Ltd. All rights reserved.