2-Alkyl-3-cyclopentenones were prepared in moderate yields starting from tetrahydrothiopyran-4-one by the one-pot Ramberg–Bäcklund reaction of 6-alkyl-1,4-dioxa-8-thiaspiro[4.5]decane 8,8-dioxides, followed by acid catalyzed de-dioxolanation.
通过 6-烷基-1,4-二氧杂-8-
硫杂
螺[4.5]癸烷 8,8-二氧化合物的 Ramberg-Bäcklund 一锅反应,以
四氢噻喃-4-酮为起点,制备了 2-烷基-3-
环戊烯酮,收率适中,随后在酸催化下进行了去二
氧戊环化反应。