β-Secretase (BACE1) has been broadly documented as one of the possible therapeutic targets for the treatment of Alzheimer's disease. In this paper, we report the synthesis and the for β-secretase (BACE-1) inhibitory activity of new series of tetrahydrobenzo [b] pyran derivatives. One-pot synthesis of tetrahydrobenzo [b] pyrans was carried out by condensing aromatic aldehyde, malononitrile and 1,3-cyclohexanedione using ionic liquid 1-butyl-3-methyl imidazolium chloride ([bmIm]Cl-) in aqueous alcohol media. The addition of alcohol and water in the ratio of 1:2 keeps all the reactants in solution which facilitates the reaction and makes the product formation very easy. The synthesized compounds were subjected to BACE1 inhibition assay and six compounds, 4d, 4e, 4f, 4h, 4i, and 4p have shown significant IC50 values at micromolar level. Among these six active compounds, 4e was a potential inhibitor with its IC50 value in nanomolar range. All the synthesized compounds were docked onto the active site of β-Secretase enzyme.

中文翻译：

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四氢苯并[b]吡喃衍生物的合成，分子建模和BACE-1抑制研究。

β-分泌酶（BACE1）已被广泛证明是治疗阿尔茨海默氏病的可能治疗靶标之一。在本文中，我们报告了新系列的四氢苯并[b]吡喃衍生物的合成及其对β-分泌酶（BACE-1）的抑制活性。一锅法合成四氢苯并[b]吡喃是通过在水性醇介质中使用离子液体1-丁基-3-甲基咪唑鎓氯化物（[bmIm] Cl-）缩合芳族醛，丙二腈和1,3-环己二酮来进行的。乙醇和水的比例为1：2，可使所有反应物保持在溶液中，这有助于反应并非常容易地形成产物。对合成的化合物进行BACE1抑制分析，六个化合物4d，4e，4f，4h，4i和4p在微摩尔水平显示出显着的IC50值。在这六种活性化合物中，4e是一种潜在的抑制剂，其IC50值在纳摩尔范围内。所有合成的化合物都停靠在β-分泌酶的活性位点上。