A Willgerodt–Kindler Type Selenation of Dihalomethane Derivatives, Chloroform, and Sodium Trichloroacetate by Treating with a Base, Elemental Selenium, and an Amine
Convenient Syntheses of N,N-Dialkylselenoamides and N,N,N′,N′-Tetraalkylselenoureas by Treating Terminal<i>gem</i>-Dihaloalkanes, Chloroform, or Sodium Trichloroacetate with a Base, Elemental Selenium, and Amines
Treatment of terminal gem-dihaloalkanes, chloroform, or sodium trichloroacetate with elemental selenium in the presence of NaH and an excess amount of primary or secondary amines gave selenoamides and selenoureas in modest yields.
We investigated the scavenging effects of tertiary selenoamide compounds for super oxide radicals using a highly sensitive and quantitative chemiluminescence method. At 333 nM, tertiary selenoamide compounds scavenged 25.8-81.6% of O-2(-.).N-(Phenylselenocarbonyl) piperidine was the most effective scavenger of superoxide radicals. While N,N-diethyl-2-selenonaphthylamide and N,N-diethyl-4-chloroselenobenzamide was a moderately effective scavenger of superoxide radicals. The IC50 of N-(phenylselenocarbonyl) piperidine and N,N-diethyl-2-selenonaphthylamide were determined to be 110 and 182 nM, respectively. The results suggest that tertiary selenoamide compounds are useful scavengers of superoxide radicals. (C) 2004 Elsevier B.V. All rights reserved.