Opportunities for insiders: A catalytic pinacol-type reductiverearrangement of 1,2-internal diols was developed by the use of a simple boron catalyst and two silanes (see scheme). The reaction occurs through a concerted, stereoinvertive mechanism and is applicable to several substrate scaffolds not usually amenable to pinacol-type reactions, such as aliphatic secondary–secondary diols, without the
Ring enlargement through acyloin condensation of cycloalkane-1,2-dicarboxylic esters
作者:T. Mori、T. Nakahara、H. Nozaki
DOI:10.1139/v69-540
日期:1969.9.1
13-membered rings were prepared from cyclododecanone. Acyloincondensation of these esters in the presence of trimethylchlorosilane followed by acidic hydrolysis afforded 13-, 14-, and 15-membered cycloalkane-1,2-diones in 71–74% yields. The diketones were reduced by treatment with triethyl phosphite and alkali hydroxide into corresponding acyloins.