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Three new amino acid derivatives (1–3) and three known ones (4–6) were isolated from the mushroom Pleurocybella porrigens. The structures of 1–6 were determined by the interpretation of spectroscopic data. Compounds 1, 3, 4, and 5 were toxic to mouse cerebrum glial cells.
A cationic iridium complex catalyzes a cycloisomerization of nitrogen-bridged 1,6-enynes to give 3-azabicyclo[4.1.0]heptenes in good to high yield. When an iridium-chiral diphosphine complex is used, the reaction proceeds enantiomerically to give chiral cyclopropanes fused by a six-membered ring system.
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