Sodium selenide

Abstract

(A) Synthesis of Functionalized Divinyl Selenides: Potapov et al. have found that functionalized divinyl selenides can be synthesized by regio- and stereoselective addition of sodium selenide to ethynyl ketones. Figure present. (B) Synthesis of Selenopyran-3-carboxamide Derivatives: The [5+1]-annulation reactions of α-alkenoyl-α-carbamoylketene dithioacetals with Na 2Se afforded highly functionalized selenopyran-3-carboxamide derivatives in high yields. Figure present. (C) Synthesis of Dipropargyl Selenide: Amosova et al. have developed a simple and efficient procedure for conversion of propargyl bromide into dipropargyl selenide. Figure present. (D) Synthesis of 1-Thia-4-chalcogenacyclohexane-1-oxides and 1,1-Dioxides: Potapov et al. reported that 1-thia-4-chalcogenacyclohexane-1-oxides and 1,1-dioxides can be obtained via the addition of sodium selenide to divinylsulfoxide and sulfone. Figure present. (E) Synthesis of Substituted Selenophenes: Sommen et al. reported a simple and efficient method for the synthesis of various substituted selenophenes. Selenophenes were successfully prepared from ketene dithioacetals and sodium selenide along with ethyl bromoacetate, chloroacetonitrile, chloroacetone and bromoacetophenone in moderate to good yields. Figure present. (F) One-pot Synthesis of Substituted 3-Amino-2-nitroselenophenes: One-pot synthesis of substituted 3-amino-2-nitroselenophenes has been achieved via a three-step procedure by using β-chloroacroleins, sodium selenide and bromonitromethane. Figure present. (G) Synthesis of 2,4,5-Trisubstituted Selenazoles: Thomae et al. reported that 2,4,5-trisubstituted selenazoles can be obtained by a one-pot, four-step procedure from azomethine dithioacetals. Figure present. (H) Synthesis of 2,3,4-Substituted Selenophenes: 2,3,4-Trisubstituted selenophenes can also be synthesized by a Fiesselmann's reaction implying a β-chloroacrolein, sodium selenide and an alkyl bromoacetate. © Georg Thieme Verlag Stuttgart. New York.