Propiolophenone derivatives of the formula ##STR1## wherein R.sup.6 is hydrogen, lower alkyl or a group of the formula ##STR2## as well as corresponding hydroxy compounds of the formula ##STR3## wherein R.sup.6' is hydrogen, lower alkyl, a group of formula (a), (b), (c), (d) or (e) or a group of the formula --C(R.sup.14)(R.sup.15)OR.sup.16' (f'): exhibit mucosa-protective and/or gastric acid secretion-inhibiting properties, such that they can be used for the control or prevention of illnesses of the gastrointestinal tract, especially against gastric ulcers and/or duodenal ulcers.
作者:Joshua J. Kennedy-Smith、Lauren A. Young、F. Dean Toste
DOI:10.1021/ol049649p
日期:2004.4.1
A mild aromaticpropargylation reaction, employing an air- and moisture-tolerant rhenium-oxo complex ((dppm)ReOCl(3)) as a catalyst and a propargyl alcohol as the electrophile, is described. The reaction tolerates a broad range of functional groups and regioselectively affords propargylic arenas without formation of the isomeric allenyl adducts. The potential of this rhenium(V)-catalyzed reaction is
γ-hydroxy-α,β-alkynoic esters to produce γ-hydroxy-α,β-(E)-alkenoic esters using LiAlH4 is reported. The application of this methodology is demonstrated by a formal synthesis of the potentcell–celladhesioninhibitors (+)-macrosphelides A and B.