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The design and construction of the first multicomponent stepwise assembly of a -based (tpy=terpyridine), three-dimensional… Expand Transition-metal-catalyzed coupling reactions involving unactivated C(sp) H bonds constitute one of the most active research… Expand Solavetivone, a potent antifungal phytoalexin, is derived from a vetispirane-type sesquiterpene, premnaspirodiene, by a putative… Expand Summary.The focus has been on the development of methodology for stereoselective preparation of spiroannulated intermediates of… Expand We reported earlier on the observation in bark of Siberian ( L rix sibirica Ledeb.) and Gmelin larch [ L. gmelinii (Rupr.) Rupr… Expand Derivatives of the tri-spirane pentaerythritoxy-cyclophosphazene compound, 1, have been used to investigate the stereogenic… Expand A novel family of cystine-based spirobicyclic peptides (cystinospiranes) has been synthesized by a single-step procedure… Expand Spiro ring systems have two or more rings linked by one common atom. Several different methods are used to name such systems… Expand DL-Tryptophan in 0,1 N HCl reacts with ninnydrin (triketoindane hydrate) at room temperature to give a brown precipitate; washing… Expand 5-Keto-D-fructose (5KF) is isolated from cultures of Gluconobacter cerinus growing on D-fructose as the sole carbon source. 5KF… Expand