A New 3-(Phenylseleno)allylic Cation: Its Regioselective C−C Bond Formation Reaction with Nucleophiles
作者:Masaru Hibino、Tomoko Koike、Mitsuhiro Yoshimatsu
DOI:10.1021/jo010331+
日期:2002.2.1
with other Lewis acids such as EtAlCl2 or SnCl4 gave 5-(phenylseleno)- 6 or non-selenopentane-1,4-dione 7, respectively. Novel prop-2-enal acetals 2-4 and 13-15 reacted with various nucleophiles to give pent-4-enophenones 5a,b, 10a, 12, and 16-18, S-ethyl pent-4-enoate 5b, alkylated vinylic sulfide 10b, 3-pentenenitrile 5d, and 10c. A versatile pent-4-enophenone 5a could be converted to tetrahydrofuran
使用各种路易斯酸检查了使用2-乙氧基-3-(苯基硒代)丙-2-烯醛缩醛2形成的非常有用的CC键。2在BF(3)* Et2O,ZnBr2或SnBr4的存在下与甲硅烷基烯醇醚的反应区域选择性地提供了高收率的(Z)-3,4-二乙氧基-5-(苯基硒代)戊-4-烯酮5a 。另一方面,与其他路易斯酸如EtAlCl 2或SnCl 4的反应分别得到5-(苯基硒代)-6或非硒代戊烷-1,4-二酮7。新型丙-2-烯缩醛2-4和13-15与各种亲核试剂反应,生成戊-4-烯酮5a,b,10a,12和16-18,戊-4-烯酸S-乙酯5b,烷基化乙烯基硫化物10b,3-戊烯腈5d和10c。多用途的戊-4-烯酮5a可以转化为四氢呋喃20和五,2,4-二烯苯酮19,