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A Study of Palladium Catalyzed intra/intermolecular Cascade Cross coupling/cyclizations Involving Bicyclopropylidene

A Study of Palladium Catalyzed intra/intermolecular Cascade Cross coupling/cyclizations Involving Bicyclopropylidene

Aydin Demircan

Molecules. 2014 May 13;19(5):6058-69.

PMID: 24828378

Abstract:

The compounds [3-(2-Bromocyclohex-2-enyloxy)prop-1-ynyl]-tert-butyl-dimethylsilane 3, [4-(2-bromocyclohex-2-en-1-yloxy)but-2-yn-1-yloxy]tert-butyldimethylsilane 5 and dimethyl 2-(2-bromocyclohex-2-enyl)-2-(3-(tert-butyldimethylsilanyl)prop-2-ynyl)malonate 9 were prepared and subjected to palladium-catalyzed intra-intermolecular cascade cross couplings incorporating bicyclopropylidene 10 under two types of conditions. In the presence of Pd(OAc)2, PPh3 and K2CO3 in acetonitrile at 80 °C, the products were indene analogues, cross-conjugated tetraenes 11, 12 and 13, respectively. The corresponding spirocyclopropanated tricycle 16 in dimethylformamide at 110 °C was obtained, albeit in low yield (24%), and observed as an equimolar mixture of diastereomers, whereas 14, 15 were not fully isolated.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP29681570	tert-Butyldimethylsilane		29681-57-0	Price

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