In:
European Journal of Organic Chemistry, Wiley, Vol. 2019, No. 31-32 ( 2019-09), p. 5385-5395
Abstract:
gem ‐Diarylheterocycles display a wide range of biological activity. Here we present a systematic study into the formation of 4‐ to 6‐membered O‐ and N‐heterocycles and cyclobutanes bearing the diaryl motif through a catalytic Friedel–Crafts reaction from the corresponding benzylic alcohols. 3,3‐Diaryltetrahydrofurans, 4,4‐diaryltetrahydropyrans, 3,3‐diarylpyrrolidines, 4,4‐diaryl‐piperidines, as well as diarylcyclobutanes are examined, with results for 3,3‐diaryloxetanes and 3,3‐diarylazetidines presented for comparison. Three catalytic systems are investigated for each substrate [Ca(II), Li(I) and Fe(III)], across preinstalled aromatic groups of differing electronic character. In most cases examined, the diaryl product is obtained directly from the alcohol with good yields using the most appropriate catalyst system. In the absence of a nucleophile, the olefins from the 5‐ and 6‐membered substrates by elimination of water are obtained under the same reaction conditions.
Type of Medium:
Online Resource
ISSN:
1434-193X
,
1099-0690
DOI:
10.1002/ejoc.v2019.31-32
DOI:
10.1002/ejoc.201900498
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1475010-7
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