The photoreactivity of 9-thiabicyclo[3.3.1]nonan-3-one 9 is investigated under a variety of conditions and compared with those of its monocyclic or norbicyclic analogues 1 and 4. The principal reaction of ketone 9 on irradiation in tert-butyl alcohol is the Norrish type I cleavage to yield tert-butyl (cis-6-methyltetrahydrothiopyran-2-yl)acetate 10a, while compounds 1 and 4 give ring-contracted thilactones
Ireland; Smith, Chemistry and industry, 1959, p. 1252
作者:Ireland、Smith
DOI:——
日期:——
Tropane alkaloid metabolism by Pseudomonas AT3 cell cultures: Interchange between the nortropine and norpseudotropine catabolic pathways
作者:Katarzyna Kosieradzka、Pauline Le Faouder、Roland Molinié、Emmanuel Gentil、Jacques Lebreton、Richard J. Robins
DOI:10.1016/j.phytol.2014.04.014
日期:2014.12
Selected strains of Pseudomonas bacteria can degrade tropane alkaloids to obtain both nitrogen and carbon for growth. In order to probe the mechanisms of the catabolic enzymes involved, the metabolic process responsible for the opening of the 8-azabicyclo[3.2.1]octan-3-ol ring of nortropane alkaloids has been explored. It is found that the bacteria contain considerable flexibility in their enzyme complement and can convert (3-endo)-8-azabicyclo[3.2.1] octan-3-ol) (nortropine (2) to (3-exo)-8-azabicyclo[3.2.1] octan-3-ol) (norpseudotropine). Both of these compounds can serve as substrates for the catalytic cascade. In order to establish the proportionation between direct and indirect pathways, metabolism has been probed by competitive substrate availability and by incorporation of stable heavy labels into substrate pools. The results indicate that, while norpseudotropine is almost entirely metabolized directly, nortropine is partitioned c. 4:1 between direct and indirect catabolism. (C) 2014 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.