A novel series of N-(1-aminoalkylidene)carboximidamides as potential hypoglycemia agents
作者:Henry J. Breslin、Michael J. Kukla、Robert W. Tuman、Mary C. Rebarchak、Charles R. Bowden
DOI:10.1021/jm00063a009
日期:1993.5
Nitrogen heterocyclic carboximidamides, such as linogliride, 1a, have been shown to possess significant hypoglycemic activity and have shown clinical efficacy as potential antidiabetic agents. We evaluated the biological significance of the heterocyclic ring A of general structure 1, which has always been maintained in this class of compounds, by preparing acyclic compounds of general structure 2.
An in-depth analysis of the effect of substituents on imines in cycloaddition reactions with nitrosoalkenes
作者:Alka Marwaha、Parvesh Singh、Mohinder P. Mahajan
DOI:10.1016/j.tet.2006.03.047
日期:2006.6
An in-depth experimental and theoretical analysis of the reactions of simple acyclic imines with nitrosoalkenes is reported. The effect of the substituents on nitrogen as well as carbon atom of imines on the cycloaddition pathways followed is systematically explored. The reactions of various functionalized imines with nitrosoalkenes leading to the formation of imidazoles and imidazole-N-oxides have
The synthesis of 2-amino-4(3H)-quinazolinones and related heterocycles via a mild electrocyclization of aryl guanidines
作者:Zachary S. Sales、Neelakandha S. Mani、Brett D. Allison
DOI:10.1016/j.tetlet.2018.03.034
日期:2018.4
A new method for the preparation of 2-amino-4(3H)-quinazolinones and similar fused heterocycles is described. Simply warming a mixture of an aryl guanidine and carbonyl diimidazole in acetonitrile results in formation of a putative N-amidinoisocyanate intermediate which undergoes a 6π-electron electrocyclic reaction with the aryl ring to generate the quinazolinone ring system. The mild conditions are
Process for producing guanidines such as linogliride and process for intermediates
申请人:McNeilab, Inc.
公开号:EP0195620A2
公开(公告)日:1986-09-24
Novel synthetic steps and intermediates leading to guanidines such as the anti-diabetic compound linogliride. Included is a hydrogen peroxide oxidation of a thiourea (II) to a sulfonic acid (I) which may then be reacted with morpholine to form the carboximidamide (III):
Process for producing amidine sulfonic acid intermediates for guanidines
申请人:McNeilab, Inc.
公开号:EP0248586A2
公开(公告)日:1987-12-09
An efficient synthesis of quanidines, e.g. of the formula (III), by oxidizing a thiourea, e.g. of the following formula (II):
with H₂O₂ and a molybdenum catalyst to yield an aminoiminomethane sulfonic acid which can then be reacted with an amine followed by optional transamination steps.