Synthesis 2002(18): 2771-2777
DOI: 10.1055/s-2002-35997
PAPER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Tetra(BINOL) Substituted Spirobifluorenes

Arne Lützen*, Frank Thiemann, Sven Meyer
University of Oldenburg, Department of Chemistry, P. O. Box 2503, 26111 Oldenburg, Germany
e-Mail: arne.luetzen@uni-oldenburg.de;
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Publikationsverlauf

Received 19 August 2002
Publikationsdatum:
06. Dezember 2002 (online)

Abstract

A series of tetra(BINOL) substituted spirobifluorenes (1, 12-15) has been prepared via fourfold Sonogashira cross-coupling reaction from 2,2′,7,7′-tetraiodospirobifluorene (3) and 2,2′-bis(methoxymethoxy)-3-ethynyl-1,1′-binaphthyl (10) or 2,2′-bis(methoxymethoxy)-3-ethynyl-3′-[(trimethylsilyl)ethynyl]-1,1′-binaphthyl (11), respectively. Whereas the deprotection of the readily available fully methoxymethyl ether protected precursors 12 and 13 proved to be difficult in the case of the sterically shielded spirobifluorenes 14, 15, not further substituted tetra(BINOL) 1 could be obtained in good yield after acidic hydrolysis. This chiral spirobifluorene closely reassembles the structure of copper(I) or silver(I) complexes of a bis(BINOL) substituted 2,2-bipyridine (2) and can also form two clefts with the BINOL groups orientated in a fashion potentially useful for the co-operative molecular recognition of chiral substrates.

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