Novel diamides and method for improving feed utilization and lactation
申请人:Eastman Kodak Company
公开号:US05041452A1
公开(公告)日:1991-08-20
Novel diamides having a nitrogen-containing heterocyclic moiety such as pyridyl are disclosed that are useful for improving feed utilization efficiency of ruminants and for improving lactation of lactating ruminants.
Heterocyclic diamides and method for improving feed utilization and
申请人:Eastman Kodak Company
公开号:US04895951A1
公开(公告)日:1990-01-23
Novel diamides having a nitrogen-containing heterocyclic moiety such as pyridyl are disclosed that are useful for improving feed utilization efficiency of ruminants and for improving lactation of lactating ruminants.
Treatment of widely available isocyanates with monohalolithium and dihalolithium carbenoids provides a valuable protocol for the one-pot preparation of -halo- and ,-dihaloacetamide derivatives. While monohalolithium carbenoids can be prepared by a smooth lithium-halogen exchange, the preparation of the corresponding dihalo compounds proved to be highly dependent on the base used to realize the deprotonation, with lithium 2,2,6,6-tetramethylpiperidine emerging as optimal. The clear advantages of the procedure are: (a) broad scope of isocyanates that can be employed; (b) preservation of the optical purity when chiral materials are used; (c) divergent access to different haloamides by simply selecting the homologating agents. We also report an application of Charette's imidoyl triflate activation of a secondary amide to the synthesis of an -chloro ketone and N-15 NMR data for selected compounds.
329. The acid-catalysed heterolysis of amides with alkyl-nitrogen fission (A AL)