已经发现三氟乙酸是用于串联克莱森重排和环化反应以从由S N 2反应获得的化合物产生3-芳基亚甲基-3,4-二氢-1 H-喹啉-2-酮的高效和高效试剂。DABCO存在下苯胺与丙烯酸Bayis-Hillman加合物的乙酰基衍生物之间的关系。相反,在三氟乙酸处理下,从Baylis-Hillman丙烯腈加成物的乙酰基衍生物获得的类似化合物通过串联Claisen重排,环化和异构化直接提供3-芳基甲基-2-氨基-喹啉。
在碳酸钾(K2CO3)作为碱催化剂存在下,在N,N-二甲基甲酰胺(DMF)中顺利实现了N-取代的唑丙烯腈的区域和立体选择性合成。在容易获得的N-乙酰基唑与Baylis-Hillman腈之间进行一锅法反应后,以中等至良好的收率(39%–87%)获得了N-取代的唑丙烯腈。结构测定通过NOESY 1 H NMR和X射线晶体学完成。
A series of pyran derivatives (5–27) were synthesized in good yields by utilizing Baylis–Hillman chemistry and were further investigated for their in vitro anticancer, antibacterial, and antifungal activities. Most of the tested compounds exhibited promising antibacterial activity as compared to the standard towards Gram-positive bacterial strains. The compounds 5–7, 11–13, and 17–19 displayed two-fold
A series of deep eutectic solvents (DESs) based on choline chloride were prepared and used in the Morita–Baylis–Hillman (M–B–H) reaction. Research showed that the composite solvent (1ChCl/2Gly DES–H2O) is a very effective solvent media for all substrates tested. Under the mild reaction conditions, DABCO catalyzed M–B–H reactions proceed very quickly and efficiently. It is particularly important that
The halogen-bonded adduct between DABCO and two molecules of perfluorooctyl iodide (DABCO.(C(8)F(17)I)(2)) acts as a recyclable organocatalyst for the Morita-Baylis-Hillman reaction. This "supramolecular fluorous catalyst" is readily accessible and can be recovered by simple precipitation/filtration.
Expeditious synthesis of 5,6,7,8-tetrahydro-imidazo[1,2-a]pyrimidin-2-ones and 3,4,6,7,8,9-hexahydro-pyrimido[1,2-a]pyrimidin-2-ones
作者:Richa Pathak、Sanjay Batra
DOI:10.1016/j.tet.2007.06.115
日期:2007.9
convenient synthesis of new 5,6,7,8-tetrahydro-imidazo[1,2-a]pyrimidin-2-ones and 3,4,6,7,8,9-hexahydro-pyrimido[1,2-a]pyrimidin-2-ones from the Baylis–Hillman adducts of acrylonitrile and their derivatives is described. A common strategy employed to achieve the syntheses of title compounds involved generation of diamines from different Baylis–Hillman derivatives followed by treatment with cyanogen bromide