Practical organic synthesis with strained ring molecules. Rhodium catalyzed carbonylation of cyclopropenecarboxylate esters and cyclopropenyl ketones to .alpha.-pyrones and of vinylcyclopropenes to phenols
A synthesis of substituted 2-pyrones by carbonylative cross-coupling-thermolysis of 4-halocyclobutenones with alkenyl-, aryl-, and heteroarylstannanes
作者:Lanny S Liebeskind、Jianying Wang
DOI:10.1016/s0040-4020(01)87262-8
日期:1993.1
Palladium catalyzed carbonylative cross-coupling of 4-chloro-2,3-disubstituted-2-cyclobutenones with alkenyl-, aryl-, and heteroaryltin reagents and thermolysis provides a general method for the synthesis of 2,3,6-trisubstituted-2-pyrones. The reaction is regiospecific, coupling occurring preferentially at the 4-position of the cyclobutenone.