Phenylcarbonic acids

Phytochemistry The herb contains the glucoside cyclamine, saponoids and other terpenoid saponins as well as the enzyme primveraza (Ogolevitz 1951 Amoros et al. 1987). The aboveground plant parts contain flavonoids (kaempferol, quercetin), phenylcarbonic acids (caffeic, ferulic, etc.), anthocyans and fatty oil (MedicineLib.ru 2008). 

Phytochemistry The plant contains organic acids (tartaric, citric, and malic), essential oil, diterpenoids (phytol), triterpenoids, steroids, saponins, alkaloids, choline, vitamin C, carotene, phenylcarbonic acids (rosmarinic acid), tannins, cou-marins, flavonoids, cardiac glycosides, carbohydrates and anthocyanins (cyanin and pelargonin Akopov 1990 Plant Resources of the USSR 1991). 

Phenylcarbonic acids p-Hydroxyphenyl- Growth regulator in certain... 

Characterization or N-protection of amino acids by the f-butyloxycarbonyl group can be carried out either by acyl transfer from the triazole (335) prepared as in Scheme 144 or with t-butyl phenylcarbonate in the presence of triazole (73TL469) in lower yields. Although 1,2,4-triazole acts as a catalyst in the second of these reactions, it has to be present in an equimolar amount. 

BOC-amino acids can also be prepared, in somewhat lower yields, by the reaction of the benzyltrimethylammonium salts of amino acids with t-bulyl phenylcarbonate (2,1. 85) in the presence of 1 molar eq. of triazole-1,2,4. 

Corey prepared the (6E,10Z)-LTB4 (115) from the previously described epoxy alcohol LTB4 synthon 119. Acid-catalyzed rearrangement of the derived phenylcarbonate 120 followed by protection, reductive cleavage of the vicinal carbonate, and cleavage of the resulting diol gave (2E)-r-butyldimethylsilyloxy-... 

The corresponding chloroformate has no effect on oximes [58] but if the latter are first converted into their phenylcarbonates (14) with phenyl chloroformate and these are heated to eliminate carbon dioxide, the nitriles are formed in 85—90% yield [59]. This method does not involve basic or acidic reagents. 

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