Efficient pentannelation of cis- and trans-1-decalones
Abstract
Reaction of 2-isopropylthiomethylene derivatives of 1-decalones (6), (7), and (8) with lithium tetramethylpiperidide and methyl acrylate lead to cycloadducts (9), (12), and (15) which are converted into annelated cyclopentenones.