A new general route for the title olefins 5a-e, 12, 13, 8a-e and 11a-e has been developed through nucleophilic addition of respective Grignard reagents i.e. allyl-, benzyl-, 1-(naphthylmethyl) magnesium halides to 5-aryl- 1,1-bis(methylthio)pent-4-en-3-ones, 7-aryl-1,1-bis(methylthio)hepta-4,6-dien-3-ones and 9-phenyl-1, 1-bis(methylthio)nona-4,6,8-trien-3-one followed by cycloaromatization of the resulting 3-substituted 1,1-bis(methylthio)alken-3-ols in the presence of boron trifluoride-diethyl ether complex.
烯丙基、苄基、1-(
萘甲基)卤化
镁与 5-芳基-1,1-双(甲
硫基)戊-4-烯-3-酮、7-芳基-1,1-双(甲
硫基)庚-4,6-二烯-3-酮和 9-苯基-1,1-双(甲
硫基)壬-4、6,8-
三烯-3-酮,然后在
三氟化硼-二
乙基醚络合物的存在下,对得到的 3-取代的 1,1-双(甲
硫基)烯-3-醇进行环芳香化反应。