ChemInform Abstract: A Facile Conversion of Diazomethyl Ketones to the Corresponding Halomethyl Ketones, and Hydroxymethyl Ketones.

ChemInform ◽  
2010 ◽  
Vol 23 (2) ◽  
pp. no-no
Author(s):  
M. HASHIMOTO ◽  
S. NIWATA ◽  
H. FUKAMI
Keyword(s):  
Diazomethyl Ketones

Synthesis and reactions of α,β-epoxy diazomethyl ketones

1974 ◽  
Vol 15 (28) ◽  
pp. 2459-2462 ◽  
Author(s):  
B. Zwanenburg ◽  
L. Thijs
Keyword(s):  
Diazomethyl Ketones

scholarly journals Affinity labelling of the Ca2+-activated neutral proteinase (calpain) in intact human platelets

1993 ◽  
Vol 289 (1) ◽  
pp. 93-99 ◽  
Author(s):  
J Anagli ◽  
J Hagmann ◽  
E Shaw
Keyword(s):  
Human Platelets ◽  
Actin Binding ◽  
Subsequent Degradation ◽  
Affinity Labelling ◽  
Intracellular Labelling ◽  
Diazomethyl Ketones ◽  
Fluoromethyl Ketone ◽  
Calpain Inhibitors ◽  
Major Target

Two irreversible calpain inhibitors, benzyloxycarbonyl (Cbz)-Leu-Leu-Tyr-Ch2F and Cbz-Leu-Leu-Tyr-CHN2, were shown earlier [Anagli, Hagmann and Shaw (1991) Biochem. J. 274, 497-502] to penetrate intact platelets and to inactivate calpain. This permitted an evaluation of certain functions attributed to this proteinase. For example, in platelets pretreated with these inhibitors, talin and actin-binding protein were protected from subsequent degradation when the Ca2+ level was raised. On the other hand, additional properties of stimulated platelets attributed to calpain remained unaffected by this treatment, and such hypotheses may be dismissed. Radioiodinated inhibitors permitted confirmation of the labelling of calpain by the procedures used. Although Cbz-Leu-Leu-Tyr-CHN2 is more effective in vitro than the corresponding fluoromethyl ketone, we now show that the latter penetrates more readily. These two inhibitors, and two additional ones, t-butyloxycarbonyl-Val-Lys(Cbz)-Leu-Tyr- CHN2 and Cbz-Leu-Tyr-CH2F, have been radioiodinated to permit a comparison of their intracellular labelling patterns in activated platelets. Calpain is the major target of all four inhibitors. Although they are closely related peptide structures, variations with respect to the labelling of additional proteins were observed. These were minor in the case of the peptidyl diazomethyl ketones, but were major in the case of the fluoromethyl ketones. However, in contrast to calpain, this labelling was neither time-dependent nor Ca(2+)-dependent. Radiolabelling and cellular fractionation studies were used to localize active calpain during platelet activation. Calpain appears to be activated in the cytosol and translocated to the membrane or cytoskeletal sites.

Studies on intramolecular alkylation. X. The acid-catalysed reactions of 5,8-Dialkoxy-1,2,3,4-tetrahydronaphthyl diazomethyl ketones

1978 ◽  
Vol 31 (7) ◽  
pp. 1561 ◽  
Author(s):  
DW Johnson ◽  
LN Mander
Keyword(s):  
Trifluoroacetic Acid ◽  
Acid Treatment ◽  
Polyphosphoric Acid ◽  
Intramolecular Alkylation ◽  
Naphthoic Acid ◽  
Acid Catalysed Reactions ◽  
Diazomethyl Ketones

5,8-Dimethoxy-3,4-dihydronaphthalen-1(2H)-one was converted into diazomethyl 5,8-dimethoxy-1,2,3,4-tetrahydro-2-naphthyl ketone (10) which, when treated with trifluoroacetic acid at 0°, gave 5,8- dimethoxy-4,4a-dihydro-3,4a-ethanonaphthalen-2(3H)-one (13), but at -15° gave 8-methoxy-1,2,3,4-tetrahydro-3,4a-ethanonaphthalene- 5(4aH),10-dione (14). 6-Methoxy-3,4-dihydronaphtha-len-1(2H)-one reacted with m-chloroperoxybenzoic acid to give 4,5-dihydro-1-benzoxepin-2(3H)-one (15) which after hydrolysis, ethylation and polyphosphoric acid treatment gave 5-ethoxy-8-methoxy-3,4-dihydronaphthalen-1(2H)-one (17). This compound was transformed into 5-ethoxy-8-hydroxy-1,2,3,4-tetrahydro-2-naphthoic acid (19) and thence to the ethoxy analogue of (14).

Additional Peptidyl Diazomethyl Ketones, Including Biotinyl Derivatives, Which Affinity-Label Calpain and Related Cysteinyl Proteinases

1993 ◽  
Vol 6 (4) ◽  
pp. 259-269 ◽  
Author(s):  
Peter Wikstrom ◽  
John Anagli ◽  
Herbert Angliker ◽  
Elliott Shaw
Keyword(s):  
Affinity Label ◽  
Diazomethyl Ketones
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