Synthesis 2016; 48(06): 893-905
DOI: 10.1055/s-0035-1560398
paper
© Georg Thieme Verlag Stuttgart · New York

Three-Step Synthesis of 3-Aminoseptanoside Derivatives by Using Lithiated Methoxyallene and δ-Siloxynitrones

Marcin Jasiński*
a   Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland   Email: mjasinski@uni.lodz.pl
,
Greta Utecht
a   Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland   Email: mjasinski@uni.lodz.pl
,
Andrzej Fruziński
b   Institute of General and Ecological Chemistry, Łódź University of Technology, Żeromskiego 115, 90-924 Łódź, Poland
,
Hans-Ulrich Reissig
c   Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany   Email: hans.reissig@chemie.fu-berlin.de
› Author Affiliations
Further Information

Publication History

Received: 24 September 2015

Accepted after revision: 04 November 2015

Publication Date:
04 January 2016 (online)


Dedicated to Professor Grzegorz Mlostoń on the occasion of his 65th birthday

Abstract

A three-step approach to enantiomerically pure 3-aminoseptanoside derivatives by addition of lithiated methoxyallene to δ-silylated aldopentose-derived nitrones, followed by Brønsted acid mediated cyclization and chemoselective N–O bond scission is presented. For the addition of the methoxyallene anion leading to 3,6-dihydro-1,2-oxazines, excellent syn-diastereoselectivities were observed in the case of d-xylose- and l-arabinose-derived nitrones, whereas the d-ribose analogue provided syn- and anti-configured products in an approximately 2:1 ratio. Subsequent proton-induced reactions provided the corresponding dimethyl ketals as kinetic products, which slowly converted into bicyclic oxepanoides formed in a highly cis-selective manner. The final reductive ring opening was performed in good yields by using an excess of samarium(II) iodide. With a selected compound it was demonstrated that this type of product is a suitable precursor for the preparation of polyfunctionalized oxepanopyrrolidine derivatives.

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