The chemical diversity and distribution of glucosinolates and isothiocyanates among plants

Methods in Lignin Chemistry

2.3. [4 + 4] Cycloadditions 1058 2.4. Photocycloadditions of Aromatic Compounds 1058 2.4.1. Benzene Derivatives 1058 2.4.2. Condensed Aromatic Compounds 1060 3. Photochemical Rearrangements 1061 4. Cyclizations 1064 4.1. Pericyclizations 1064 4.2. Norrish−Yang Reaction 1066 5. Photochemical Extrusion of Small Molecules 1067 6. Photochemical Electron Transfer 1068 6.1. Photochemical Electron-Transfer Reactions with a Catalytic Sensitizer 1068

Photochemical Reactions as Key Steps in Organic Synthesis

The [2 + 2] photocycloaddition is undisputedly the most important and most frequently used photochemical reaction. In this review, it is attempted to cover all recent aspects of [2 + 2] photocycloaddition chemistry with an emphasis on synthetically relevant, regio-, and stereoselective reactions. The review aims to comprehensively discuss relevant work, which was done in the field in the last 20 years (i.e., from 1995 to 2015). Organization of the data follows a subdivision according to mechanism and substrate classes. Cu(I) and PET (photoinduced electron transfer) catalysis are treated separately in sections 2 and 4, whereas the vast majority of photocycloaddition reactions which occur by direct excitation or sensitization are divided within section 3 into individual subsections according to the photochemically excited olefin.

http://pubs.acs.org/doi/pdf/10.1021/acs.chemrev.5b00723

Recent Advances in the Synthesis of Cyclobutanes by Olefin [2+2] Photocycloaddition Reactions

Biological activities of lignans

Hydroxybenzoic acids from Boreava orientalis

A new caffeoyl glycoside of β, 3, 4-trihydroxyphenethyl alcohol, designated as suspensaside (1), was isolated from the fruits of Forsythia suspensa VAHL (Oleaceae). The structure of 1 was established as DL-β, 3, 4-trihydroxyphenethyl-O-α-L-rhamnopyranosyl-(1→6)-4-O-caffeoyl-β-D-glucopyranoside on the basis of analysis of the carbon-13 nuclear magnetic resonance spectrum and chemical evidence. Compound 1 exhibited antibacterial activity against Staphylococcus aureus TERASHIMA. with MIC 4.1 mM (2.6 mg/ml).

https://www.jstage.jst.go.jp/article/cpb1958/30/12/30_12_4548/_pdf

Studies on the Chinese Crude Drug "Forsythiae Fructus." VI. The Structure and Antibacterial Activity of Suspensaside isolated from Forsythia suspensa

The compounds in diesel exhaust particles (DEP) that are responsible for vasodilatation were isolated and characterized for the first time. From benzene extract of DEP, 2-methyl-4-nitrophenol, 3-methyl-4-nitrophenl and 4-nitrophenol were isolated, and their vasodilatation activities were confirmed. 3-methyl-4-nitrophenol caused dilatation of rat thoracic artery, and the other two nitrophenols, also showed vasodilatation activities.

/pdf/isolation-of-nitrophenols-from-diesel-exhaust-particles-dep-1c1e2l5w6r.pdf

Isolation of Nitrophenols from Diesel Exhaust Particles (DEP) as Vasodilatation Compounds

A new caffeoyl glycoside of 3, 4-dihydroxy-β-phenethyl alcohol, designated as forsythiaside (1), was isolated from the fruits of Forsythia suspensa VAHL (Oleaceae). The structure of 1 is proposed to be 3, 4-dihydroxy-β-phenethyl-O-α-L-rhamnopyranosyl-(1→6)-4-O-caffeoyl-β-D-glucopyranside on the basis of analysis of the carbon-13 nuclear magnetic resonance spectrum.

Akiyo Sakushima

Papers

Hydroxybenzoic acids from Boreava orientalis

Studies on the Chinese Crude Drug "Forsythiae Fructus." VI. The Structure and Antibacterial Activity of Suspensaside isolated from Forsythia suspensa

Isolation of Nitrophenols from Diesel Exhaust Particles (DEP) as Vasodilatation Compounds

The Structure of Forsythiaside isolated from Forsythia suspensa

Flavonoids from Rhamnus pallasii