Total synthesis of 7-O-methyldehydropinguisenol by palladium–catalyzed 1,7-enyne cycloisomerization
摘要:
Efficient synthesis of 7-O-methyldehydropinguisenol, a typical pinguisance-type sesquiterpene with a furan moiety, was accomplished by applying palladium-catalyzed 1,7-enzyme cycloisomerization for the construction of six-membered ring hearing an exomethylene as well as of adjacent quaternary centers. (C) 2002 Elsevier Science Ltd. All rights reserved.
Described is a short-step synthesis of optically active yamataimine, a 12-membered pyrrolizidinealkaloid of retronecine type. Methyl (1S,5R)-5-methyl-2-oxocyclopentanecarboxylate derived from (R)-(+)-pulegone was converted into the necic acid component required for the synthesis of yamataimine, in a nine-step sequence. Regioselective coupling of (+)-retronecine with the necic acid component via tin-mediated
Synthese a partir de retronecine et d'acide d'integerrinecique en utilisant le groupe methylthiomethyl comme groupe protecteur activable de la fonction acide
Synthese a partir de retronecine et d'acide d'integerrinecique en utilisant le groupemethylthiomethyl comme groupe protecteur activable de la fonction acide
STEREOSELECTIVE SYNTHESIS OF (±)-INTEGERRINECIC ACID
作者:Koichi Narasaka、Tadafumi Uchimaru
DOI:10.1246/cl.1982.57
日期:1982.1.5
A synthesis of (±)-integerrinecic acid, an acid part of 12-membered bislactonic pyrrolizidine alkaloid, has been achieved stereoselectively starting from 2-methyl-2-cyclopentenone.