作者:Zorica M. Bugarčić、Biljana Mojsilović、Ljiljana Marjanović、Stanimir Konstantinović
DOI:10.1007/s007060070042
日期:2000.10.16
The reaction of somealkenols with tetrachloromethane in the presence of a radical initiator was investigated. Regarding the effects of structural features of the starting alkenol (number and position of methyl substituents at the double bond and at the carbinol carbon atom, constitutional relationship between the double bond and the hydroxyl group) there are two possible competing reactions: addition
Lewis Acid Mediated Cyclizations: Diastereoselective Synthesis of Six- to Eight-Membered Substituted Cyclic Ethers
作者:Arun Ghosh、Anthony Tomaine、Kelsey Cantwell
DOI:10.1055/s-0036-1589054
日期:2017.9
Lewis acid catalyzed synthesis of medium-sized cyclicethers in a diastereoselective manner. Cyclicethers are widely abundant in natural products. Cyclicether templates are also utilized in drug design and medicinal chemistry. Although the synthetic processes for this class of compounds have been studied extensively with respect to five- and six-membered rings, medium-sized cyclicethers are synthetically
Basic elimination of sulfonium salts. Neighbouring group influence on regioselectivity.
作者:B. Badet、M. Julia、J.M. Mallet、C. Schmitz
DOI:10.1016/s0040-4039(00)88333-1
日期:1983.1
A simple preparation of sulfonium salts functionalized by oxygenated groups is reported. The nature and the position of the latter control the regiochemistry of elimination of the sulfonium moiety leading to selective formation of Saytsev or Hofmann olefins.
-catalyzed reaction of (Z)-6-trimethylsilyl-5-hexen-1-ol with aldehydes gives trans2,3-disubstituted tetrahydropyrans (THPs) with high stereoselectivity (Scheme 1). 5 The reaction mechanism involves alkene migration of the vinylsilane and subsequent annulation of the resultant allylsilane with an aldehyde via an oxocarbenium ion intermediate. In view of the reactivity of oxocarbenium ions toward the ene-type
One-step cyclization of alkenols has been accomplished by electrooxidative phenylselenoetherification. The reaction was performed by electrolysis of unsaturated alcohols and diphenyl diselenide in methylene chloride containing tetraethylammonium bromide.