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.
Preparation of 1,5‐Fused Tetrazoles Under Solvent‐Free Conditions
作者:Hossein Eshghi、Asadollah Hassankhani
DOI:10.1081/scc-200054219
日期:2005.4.1
Abstract A facile and efficient procedure is developed for a one‐pot synthesis of fused 1,5‐disubstituted tetrazoles from cyclic ketones and sodium azide in the presence of aluminum chloride in solvent‐free media. Advantages of this method are chemoselectivity, with high yields in a simple operation, and short reaction time under solvent‐free conditions.
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.
Pentamethylenetetrazole (VIII) on gas-phasepyrolysiseliminates nitrogen and gives 4-pentenyl-cyanamide (IX). The latter undergoes ring closure to 1-cyano-2-methylpyrrolidine (X). Tetramethylenetetrazole (XII) similarly gives 3-butenylcyanamide (XIII) and 1-cyanopyrrolidine (XIV). Trimethylenetetrazole (XVI) gives nitrogen, ethylene, and a compound C2H2N2, which most likely is N-cyanoformimine, CH2NCN
在气相热解中的五亚甲基四唑(VIII)除去氮,得到4-戊烯基氰酰胺(IX)。后者进行1-氰基-2-甲基吡咯烷(X)的闭环。类似地,四亚甲基四唑(XII)得到3-丁烯基氰酰胺(XIII)和1-氰基吡咯烷(XIV)。三亚甲基四唑(XVI)得到氮,乙烯和化合物C 2 H 2 N 2,最有可能是N-氰基甲亚胺CH 2 = N = CN。
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