The photocycloaddition of cyclohex-2-enones 1a, 1b, and 5a5c to acrylonitrile (2) in benzene has been studied. The reactions proceed with moderate regioselectivity and with preferential formation of diastereomeric mixtures of endo- and exo-5-oxobicyclo[4.2.0]octane-7-carbonitriles 3, 4, and 68. Very similar relative rates of conversion to products are observed in the photocycloadditions of 1b, 5a
transformation of enones was investigated with cultured cells of Synechococcus sp. PCC 7942 (a cyanobacterium). The cells reduced both the endocyclic C-C double bond of s-trans enones and the exocyclic C-C double bond of s-cis enones with high enantioselectivity to afford optically active α-substituted (S)-ketones under illumination. In addition, the reduction of the double bond of these enones was accompanied
用聚球藻的培养细胞研究了烯酮的不对称转化。PCC 7942(一种蓝细菌)。细胞以高对映选择性减少了 s-trans enones 的内环 CC 双键和 s-cis enones 的外环 CC 双键,以在光照下提供光学活性的 α-取代 (S)-酮。此外,这些烯酮双键的还原伴随着饱和醇的形成。细胞优先将简单的脂肪酮而不是环状酮还原为相应的(S)-醇,具有出色的对映选择性。
Studies toward the Total Syntheses of Cucurbitacins B and D
作者:Michael E. Jung、Rebecca M. Lui
DOI:10.1021/jo101242e
日期:2010.11.5
Synthetic efforts toward the convergent construction of the tetracyclic triterpenoids cucurbitacins B and D are described. The results of a Diels−Alder study examining the effects of steric and electronic variations of 2-methyl-2-cyclohexenone on the endo/exo-diastereoselectivity of the reaction are presented. The diastereomer of the core of the cucurbitacins, epimeric at C8, C9, and C10, 51, was synthesized
π, π*-Induced Photocleavage of γ, δ-Epoxy-eucarvone.
π,π*诱导的γ,δ-环氧-真黄酮的光解。
PYRAZOLO-QUINAZOLINE DERIVATIVES, PROCESS FOR THEIR PREPARATION AND THEIR USE AS KINASE INHIBITORS
申请人:NERVIANO MEDICAL SCIENCES S.R.L.
公开号:US20150158876A1
公开(公告)日:2015-06-11
Pyrazolo-quinazoline derivatives of formula (Ia) or (Ib) as defined in the specification, and pharmaceutically acceptable salts thereof, process for their preparation and pharmaceutical compositions comprising them are disclosed; the compounds of the invention may be useful, in therapy, in the treatment of diseases associated with a disregulated protein kinase activity, like cancer.