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A Convergent Pd‐Catalyzed Asymmetric Allylic Alkylation of dl ‐ and meso ‐Divinylethylene Carbonate: Enantioselective Synthesis of (+)‐Australine Hydrochloride and Formal Synthesis of Isoaltholactone
Author(s) -
Trost Barry M.,
Aponick Aaron,
Stanzl Benjamin N.
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700832
Subject(s) - enantioselective synthesis , tsuji–trost reaction , nucleophile , electrophile , chemistry , alkylation , diastereomer , catalysis , allylic rearrangement , organic chemistry , dimethyl carbonate , palladium , combinatorial chemistry
The use of a mixture of dl‐ and meso‐ divinylethylene carbonate as an electrophile in palladium‐catalyzed asymmetric allylic alkylation reactions is reported. From the diastereomeric mixture of meso and chiral racemic starting materials, a single product is obtained in high optical purity employing either oxygen or nitrogen nucleophiles. The resulting dienes have proven to be versatile synthetic intermediates as each carbon is functionalized for further transformation and differentiated by virtue of the reaction. A mechanism for this intriguing transformation is proposed and a concise enantioselective total synthesis of (+)‐australine hydrochloride is reported as well as a formal synthesis of isoaltholactone.