多环化合物的合成。第八部分 Friedel-Crafts用三羧酸的酸酐酰化。16,17-二氢-17-甲基-15 H-环戊[ a ]菲的合成
摘要:
描述了萘,1-和2-甲基萘以及1,2,3,4-四氢萘与丙烷-1,2,3-三羧酸1,2-酐及其2-甲基衍生物的酰化作用。通过这种方法已经以高收率制备了1,2,3,4-四氢-氧杂菲乙酸。中间体的结构是通过独立合成建立的。通过萘与3-甲基丁烷-1,2,4-三羧酸1,2-酐的酰化反应生成的酮酸已被用于一种新的,改进的生产16,17-二氢-17-甲基-15 H-的途径。环戊[ a ]菲(Diels烃)。由萘和2-甲基丙烷-1,2,3-三羧酸的酮酸-1,2-酐转化成外消旋的雌-1,3,5(10),6,8-五烯-17-酮[反式-(±)-3-deoxyequilenin]通过已知方法。
Replacing Conventional Carbon Nucleophiles with Electrophiles: Nickel-Catalyzed Reductive Alkylation of Aryl Bromides and Chlorides
作者:Daniel A. Everson、Brittany A. Jones、Daniel J. Weix
DOI:10.1021/ja301769r
日期:2012.4.11
general method is presented for the synthesis of alkylated arenes by the chemoselective combination of two electrophilic carbons. Under the optimized conditions, a variety of aryl and vinyl bromides are reductively coupled with alkyl bromides in high yields. Under similar conditions, activated aryl chlorides can also be coupled with bromoalkanes. The protocols are highly functional-group tolerant (−OH,
Organozinc compounds of functionalized alkyl iodide carrying an alkoxycarbonyl, cyano or alkenyl group were prepared in high yields under mild conditions (0°C-r.t., 10min in DMF) by the reaction of iodides with an electrogenerated reactive zinc (EGZn). Cross-coupling of the organozinc compounds with various aryl halides in the presence of 5 mol% Pd(P(o-Tol)3)2Cl2 in THF gave the corresponding cross-coupled
Mechanical metal activation for Ni-catalyzed, Mn-mediated cross-electrophile coupling between aryl and alkyl bromides
作者:Sisi Wu、Weijia Shi、Gang Zou
DOI:10.1039/d1nj01732b
日期:——
nickel-catalyzed, manganese-mediated cross-electrophile coupling between aryl and alkylbromides. In addition to the traditional reaction parameters, mechanical ones, e.g. the rotational speed of mill, the filling degree of jar and ball size, have been found to affect the catalytic efficiency remarkably, implying the involvement of the regeneration of nickel(0) species in the rate-determining steps. A combined evaluation