194981-61-8Relevant articles and documents
First total synthesis of rhuscholide A, glabralide B and denudalide
Li, Tian-Ze,Geng, Chang-An,Chen, Ji-Jun
, (2019/08/27)
The first total synthesis of rhuscholide A, a benzofuran lactone possessing anti-HIV-1 activity, had been accomplished in 14 linear steps with 10.6% overall yield. In this synthesis, base-mediated phenol ortho-alkylation and piperidine promoted aldol condensation were exploited as key steps. The synthesis was flexible and allowed for the convenient preparation of two analogous natural products glabralide B and denudalide.
4-hydroxy-piperidine derivatives
-
Page column 25, (2010/01/31)
The present invention relates to 4-hydroxy-piperidine derivatives of the general formula wherein X denotes —O—, —NH—, —CH2—, —CH═, —CHOH—, —CO—, —S—, —SO— or —SO2—; R1-R4are, independently from each other, hydrogen, hydroxy, lower-alkyl-sulfonylamino, 1- or 2-imidazolyl or acetamido; R5-R8are, independently from each other, hydrogen, hydroxy, lower-alkyl, halogen, lower-alkoxy, trifluoromethyl or trifluoromethyloxy; a and b may be a double bond, provided that when “a” is a double bond, “b” cannot be a double bond; n is 0-2; m is 1-3; p is 0 or 1 and to pharmaceutically acceptable addition salts thereof. Compounds of the present invention are NMDA(N-methyl-D-aspartate)-receptor subtype selective blockers, which can be used in mediating processes underlying development of CNS including learning and memory formation and function.
Photochemistry of Substituted 4,4-Dimethoxy-2,5-Cyclohexadienones
Hong, Fang-Tsao,Lee, Kung-Shing,Tsai, Yow-Fu,Liao, Chun-Chen
, p. 1 - 12 (2007/10/03)
4,4-Dimethoxy-2,5-cyclohexadienones 9-14 were prepared from the corresponding hydroquinone monomethyl ethers by oxidation with thallium trinitrate in methanol. Irradiation of solutions of 9-13 in methanol with a broad band of UV light centered at 350 nm in a Rayonet reactor afforded 2-cyclopentenone derivatives 15-19 in moderate to excellent yields, whereas irradiation of 14 in methanol gave phenol 8 along with other unidentified products. Irradiation of 11-14 in benzene yielded substituted phenols. The plausible reaction pathways for the product formation are discussed.
