Asterriquinone (ARQ, 1a) is an antitumor metabolite of Aspergillus terreus IFO 6123. To gain insight into the structure-activity relationships of ARQ, a series of chemically modified derivatives (1-6), the ARQ analogues (b-e) and the 2, 5-dihydroxy-p-bezoquinone analogues (f-h), were prepared, and cytotoxic acitivity against mouse leukemia P388 cells investigated. Results indicated that : 1) at least one hydroxy group or acetoxy group in the p-benzoquinone moiety is important to exhibit cytotoxicity; 2) in the p-benzoquinone moiety, a single methoxy group and/or one aceotxy group substitution showed more potent cytotoxicity than when two hydroxy groups are substituted (1); 3) the indole ring is important for the cytotoxicity of ARQ analogues; 4) the 1, 1-dimethly-2-propenyl group in the indole ring is not important for the cytotoxic activity of ARQ.
Asterriquinone (ARQ); 2, 5-bis[1-(1, 1-dimethyl-2-propenyl)-1H-indol-3-yl]-3, 6-dihydroxy-2, 5-cyclohexadiene-1, 4-dione and ARQ monoacetate are metabolites from mycelium of Aspergillus terreus IFO 6123. ARQ diacetate was converted into ARQ monoacetate by treatment with 5% aq. NaHCO3 in pyridine at 80°C for 5 min, and the yield was 93.4%. Similarly, by treatment with 5% aq. NaHCO3 in acetone at room temperature, 2, 5-diacetoxy-p-xyloquinone and 2, 5-diacetoxy-p-benzoquinone were converted into 2-acetoxy-5-hydroxy-p-xyloquinone (yield, 85.8%) and 2-acetoxy-5-hydroxy-p-benzoquinone (yield, 66.7%), respectively.
1H and13C NMR spectral data for a tricyclic derivative of a Diels-Alder adduct
作者:Susimaire Pedersoli、Mauricio Gomes Constantino、Gil Valdo José da Silva
DOI:10.1002/mrc.1714
日期:2006.1
A completeNMR analysis with full assignment for 1H and 13C NMRspectraldata for 5‐(acetyloxy)‐3‐hydroxy‐9,10‐dimethoxy‐6‐oxo‐11‐oxatricyclo[6.2.1.02,7]undec‐2‐yl acetate (8) is described. This compound was prepared by rapid hydrogenation of the unstable Diels–Alder adduct obtained from the reaction between 3,4‐dimethoxyfuran (4) and 2,5‐diacetoxy‐1,4‐benzoquinone (5). Full homonuclear hydrogen coupling
A pattern forming method includes: performing a first droplet ejection step by ejecting droplets containing 0.1%-2% polysiloxane by mass onto a substrate; performing a first layer forming step by solidifying the droplets ejected onto the substrate so that a first layer is formed; performing a second droplet ejection step by ejecting more droplets over the first layer; and performing a second layer forming step by solidifying the droplets ejected onto the first layer so that a second layer is formed.
POLYMERIZABLE COMPOUND AND CURABLE COMPOSITION COMPRISING SAME
申请人:Ooga Kazuhiko
公开号:US20120232183A1
公开(公告)日:2012-09-13
Provided are a polymerizable compound, a photocurable composition, and a photocurable moisture-proof insulating coating material for mounting circuit boards, which reduce environmental impact, excel in surface curability at low irradiation dose, and have high adhesion to substrate materials. The compound according to the present invention has a structural unit derived from a dimerdiol and has, as an end group, a group represented by formula (1):
wherein R
1
represents H or CH
3
and R
2
represents a hydrocarbon group having 2 to 12 carbon atoms, at an end thereof. Preferably, the compound has, as end groups, the group represented by formula (1) and a group represented by formula (2):
wherein R
3
s each independently represent CH
3
or CH
2
CH
3
, and R
4
represents a hydrocarbon group having 3 to 9 carbon atoms, at the end thereof. The structure having the structural unit derived from a dimerdiol is preferably represented by formula (3):