Acid-catalyzed hydrolysis of alkyl vinyl and propenyl sulfides
作者:T. Okuyama、M. Nakada、T. Fueno
DOI:10.1016/0040-4020(76)85140-x
日期:1976.1
ethyl, isopropyl, and t-butyle vinyl sulfides have been measured in 10% aqueous acetonitrile. It was found that their reactivities decrease in this order. General acid catalysis was observed. The rate was smaller in a deuterium medium (kD2O/kH2O = 0.34). The deuterium exchange between sulfide and solvent was not detected during hydrolysis. Some propenylsulfides have also been studied, their cis isomers
已在10%乙腈水溶液中测量了甲基,乙基,异丙基和叔丁基乙烯基硫化物的酸催化水解速率。发现它们的反应性按此顺序降低。观察到一般的酸催化。在氘代介质中的比率较小(k D 2 O / k H 2 O = 0.34)。水解过程中未检测到硫化物与溶剂之间的氘交换。还研究了一些丙烯基硫化物,它们的顺式异构体比不涉及几何异构化的反式对应物更具反应性。讨论了反应机理和取代基对反应性的影响。
A New Facile, and Convenient Synthesis of 2-Oxo-3-alkenoic Acids and Esters
Activated 1-alkenes such as ketene dithioacetals, vinyl sulfides, N-vinyl amides, and N-vinylcarbazole react with oxalyl chloride or ethoxalyl chloride in the presence of pyridine to give the 2-oxo-3-alkenoic acids or ethyl esters, respectively.
and olefinic nucleophiles containing an alkylthio substituent. Ketene dithioacetal or 2-(methylthio)allylsilane reacts with Schiff’s bases in the presence of trifluoromethanesulfonic acid to afford β-amino acid equivalents or homoallylic amines, respectively. On the other hand, ene reaction proceeds between 1-alkyl-1,2-propadienyl sulfides and Schiff’s bases by treatment with AlCl3, giving 1,3-dienes
Cyclobutane derivatives represented by the following general formula (I): ##STR1## wherein X represents a group represented by the formula ##STR2## or the formula ##STR3## which is expected to be useful as reagents, drugs, agricultural chemicals and perfumes as well as an intermediate for the preparation thereof.
In the presence of certain Lewis acids, alkenes containing an alkylthio group (for example, ketene dithioacetals, alkenyl sulfides, alkynyl sulfides, and allenyl sulfides) react with electron deficient olefins to give the corresponding cyclobutane, cyclobutene, or methylene cyclobutane derivatives. By employing a chiral titanium catalyst generated in situ from dichlorodiisopropoxytitanium and a tartrate-derived chiral diol, the [2 + 2] cycloaddition reaction proceeds with high enantioselectivity.