The Heck reaction of alkenes bearing in δ position an enolate of β-diester, βketo ester or β-sulfonyl ester leads to cyclopentanes issued from the intramolecular displacement of the carbone sp3-palladium bond by this enolate. This cyclisation is not observed when the enolate is in β or ε position or in the case of a δ-ethylenic amine and βelimination products are only obtained.
δ位置的烯烃的Heck反应是β-二酯,β-
酮酸酯或β-磺酰基酯的烯醇化物导致的
环戊烷是由烯醇sp 3-
钯键的分子内位移引起的。当烯醇化物处于β或ε位置或在δ-亚乙基胺的情况下,未观察到这种环化,并且仅获得β消除产物。