A convenient synthesis of tetrazolo[1,5-a]-α-cycloalkanones
摘要:
A convenient synthesis of a series of tetrazolo[1,5-alpha]-alpha-cycloalkanones 4a-d with the carbonyl group attached at the tetrazole carbon is described. The sequence entails the formation of an exocyclic olefin at the alpha-methylene position and subsequent ozonolysis. The reactions proceed under mild conditions, and the tetrazole moiety is well tolerated. (c) 2006 Elsevier Ltd. All rights reserved.
Compounds are provided of the following structure are HMG CoA reductase inhibitors and thus are active in inhibiting cholesterol biosynthesis, modulating blood serum lipids, for example, lowering LDL cholesterol and/or increasing HDL cholesterol, and treating hyperlipidemia and dyslipidemia, hypercholesterolemia, hypertriglyceridemia and atherosclerosis
wherein A is chosen from
B is chosen from
wherein the variables R
1
to R
7
, m, n,
are as defined herein.
A method for treating the above diseases employing the above compounds is also provided.
Selective Formation of Alkyl Azides Using Trimethylsilyl Azide and Carbonyl Compounds
作者:Kozaburo Nishiyama、Tomoko Yamaguchi
DOI:10.1055/s-1988-27481
日期:——
Whereas tin(II) chloride, or zinc chloride, catalyzed reaction of trimethylsilyl azide (TMSA) with carbonyl compounds gave gem-diazides 3, a catalytic amount of sodium azide/15-crown-5 promoted an addition reaction of TMSA toward these compounds to give α-siloxy azides 2 exclusively. A stereoelectronic effect was found to be important for these reactions.
ADDITION REACTION OF TRIMETHYLSILYL AZIDE TOWARDS KETONES AND FACILE FORMATION OF TETRAZOLE DERIVATIVES
作者:Kozaburo Nishiyama、Akio Watanabe
DOI:10.1246/cl.1984.455
日期:1984.3.5
In the presence of Lewis acid such as SnCl2, the reactions of trimethylsilylazide with ketones readily gave 1:1- or 1:2-adduct, which reacted with Lewis acid to afford tetrazole.
Remodeling and Enhancing Schmidt Reaction Pathways in Hexafluoroisopropanol
作者:Hashim F. Motiwala、Manwika Charaschanya、Victor W. Day、Jeffrey Aubé
DOI:10.1021/acs.joc.5b02764
日期:2016.2.19
The effect of carrying out two variations of the Schmidt reaction with ketone electrophiles in hexafluoroisopropanol (HFIP) solvent has been studied. When TMSN3 is reacted with ketones in the presence of triflic acid (TfOH) promoter, tetrazoles are obtained as the major products. This observation is in contrast to established methods, which usually lead to amides or lactams arising from formal NH insertion