A direct di-sulfenylation of methyl ketones with disulfides mediated by KOH-DMSO superbase system has been developed. This reaction provides an efficient route to α,α-dithioketones, which has the advantages of readily available non-prefunctionalized substrates, good functional group tolerance, excellent yields as well as high selectivity. In a single operation, two CS bonds are simultaneously built
已经开发了由 KOH-DMSO 超碱体系介导的甲基酮与二硫化物的直接二苯基化反应。该反应为制备α,α-二硫酮提供了一条有效的途径,具有易于获得的非预官能化底物、良好的官能团耐受性、优异的收率和高选择性等优点。在一次操作中,在温和的反应条件下,两个 C S 键同时建立在同一个碳原子上。
alpha,alpha-Bis(phenylseleno)ketones have been synthesized by phenylselenenylation of enolates derived from alpha-phenylseleno ketones. Depending on the structure of the ketones, three experimental procedures were adopted.
Cross-aldol reaction between benzaldehyde and β-phenylselanyl enoxysilanes derived from phenylselanylmethylketones
The BF3-mediated aldol reaction between benzaldehyde and beta-phenylselanyl enoxysilanes 1 derived from alpha-phenylselanylmethylketones has led to syn aldols 2 and alpha,alpha-bis(phenylselanyl) ketones 3 as by-products. Using tetrabutylammonium fluoride, the syn and anti aldols 2a were formed from 1a. Syn, syn-2-phenylselanyl 1,3-diols 5a and 5d were obtained by borane reduction of aldols 2a and 2d respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.