Systematic diversification of benzylidene heterocycles yields novel inhibitor scaffolds selective for Dyrk1A, Clk1 and CK2
作者:Marica Mariano、Rolf W. Hartmann、Matthias Engel
DOI:10.1016/j.ejmech.2016.02.017
日期:2016.4
The dual-specificity tyrosine-regulated kinase 1A (Dyrk1A) has gathered much interest as a pharmacological target in Alzheimer's disease (AD), but it plays a role in malignant brain tumors as well. As both diseases are multi-factorial, further proteinkinases, such as Clk1 and CK2, were proposed to contribute to the pathogenesis. We designed a new class of α-benzylidene–γ-butyrolactone inhibitors that
A concise synthesis of alpha-benzylidene-gamma-methyl-gamma-butylolactones 5a-g from substituted benzaldehydes is described. Compounds la-g on reaction with phosphorane 2, provide the pentenoates 3a-g, which can be hydrolyzed to the acids 4a-g. The latter are cyclized to the corresponding butyrolactones 5a-g in excellent yields. The pentenoates 3a-g, on acid catalyzed cyclization, also provide 5a-g in very high yields.
DATTA, APURBA;ILA, HIRIYAKKANAVAR;JUNJAPPA, HIRIYAKKANAVAR, TETRAHEDRON, 43,(1987) N 22, 5367-5374
subsequent boron-trifluoride etherate catalyzed methanolysis of the resultant carbinol acetals . Treatment of α-acetylketene dithioacetals and with methylmagnesiumiodide afforded the carbinol acetals and respectively which under above sequence of reactions yielded the corresponding α-isopropylidene-γ-butyrolactones and in good yields.