Regiospecific Allylic Mono- and Dibromination of 4-Methoxy-1,1,1-trihalo-3-alken-2-ones and 5-Methoxy-1,1,1,2,2-pentafluoro-4-hexen-2-one, and their Applications to the Synthesis of Heterocycles
作者:Marcos A. Martins、Adilson P. Sinhorin、Adriano da Rosa、Alex F. Flores、Arci D. Wastowski、Claudio M. P. Pereira、Darlene C. Flores、Paulo Beck、Rogerio A. Freitag、Sergio Brondani、Wilson Cunico、Helio G. Bonacorso、Nilo Zanatta
DOI:10.1055/s-2002-35224
日期:——
(8a) were synthesized in high purity and good yields (70-95%) by the regiospecific allylic bromination of 4-meihoxy-1,1,1-trihalo-3-alken-2-ones la-d, 2a-d, 3a or 5-methoxy-1,1,1,2,2-pentafluoro-4-hexen-2-one (4a), respectively, with bromine followed by addition of pyridine. The usefulness of compounds 5-10 in heterocyclic synthesis is also reported.
一系列十二个 5-bromo[5,5-dibromo]-4-methoxy-1,1,1-trihalo-3-alken-2-ones 5a-d、6a-d、7a、9a、10a 和 6- bromo-5-methoxy-1,1,1,2,2-pentafluoro-4-hexen-2-one (8a) 通过区域特异性烯丙基溴化 4- meihoxy-1,1,1-trihalo-3-alken-2-ones la-d, 2a-d, 3a or 5-methoxy-1,1,1,2,2-pentafluoro-4-hexen-2-one (4a) 分别用溴,然后加入吡啶。还报道了化合物 5-10 在杂环合成中的用途。