x chnvcchchnJcchchnJ
Reaction of the Mannich product 112 from acetophenone itself with the Grignard reagent from p-chlorobenzyl chloride gives the carbinol, 113. Dehydration in this case gives the antihistamine pyrrobutamine 114 .29 It is not immediately clear why dehydration does not occur in the other sense so as to afford the energetically more favored stilbene. As a class, analgesics tend to be built around portions of the morphine molecule that, as a minimum, incorporate a piperi-dine ring. The detailed...
chcc hnconh chcnhcnh
It will be recalled that both epinephrine and norepinephrine are pressor agents, that is, they cause an increase in blood pressure. It would therefore be expected that antagonists to these endogenous pressor amines might have a useful effect on hypertension. One approach to this problem consists in the preparation of compounds that interfere with biosynthesis of these amines by the administration of false substrates that would be unable to go through the final steps of biogenesis. A crucial...
Arylethylenes a nd Their Reduction Products
The isolation of the estrogens, the so-called female sex hormones, occasioned intensive work on the endocrine activity of this series of endogenous compounds. This was hampered in no small way by the minute quantities in which these hormones occur in nature as well as by the lack of sources of these agents other than isolation from mammals. However, enough data was accumulated to indicate that such agents had great potential for the treatment of the various dysfunctions that result from...
OpO M OpO
nitrogen atom in a ring is consistent with activity. Thus, condensation of iV-methyl-4-piperidone with aniline yields the corresponding Shiff base. Reduction followed by alkylation of the secondary amine 57 with benzyl chloride by means of sodium amide affords bamipine 58 .29 Substitution of a 2-pyridyl residue for the phenyl attached directly to nitrogen affords a series of potent antihistamines. I'reparation of these compounds, too, is accomplished by a series nl alkylation reactions. It is...
chcoch
bromide to give the allylic halide 53 this last would suffer displacement to lead to the observed olefin. Hydrolysis of the ester groups with concomitant decarboxylation gives the phenyl-acetic acid 54 . Esterification of the acid with 2- w-pyrroli-dino ethanol via its acid chloride affords the antispasmodic agent cyclopyrazolate 55 .13 Qch 2 2 5 - gt ft Vc-co2c2h5 -ft Vchco2h Treatment of the sodium salt of phenylacetic acid with iso-propylmagnesium bromide affords the so-called Ivanov...
Benzyl and Benzhydryl Derivatives
The previous chapter pointed up the relative paucity of useful medicinal agents to be found among simple monocyclic alicyclic compounds. Current intensive research on the prostaglandins may, of course, change that in the future. It is well known, however, that the chances of finding a biologically active molecule increase dramatically with the incorporation into the structure of one or more aromatic or heteroaromatic rings. This common observation has been ascribed to many of the known...
Synthesis Of Captodiamine
Inclusion of a second nitrogen atom in the side chain seemingly increases the spasmolytic effect of the benzhydrol derivatives. Alkylation of the benzdryl chloride 9 with the sodium salt obtained from N- 2-hydroxyethyl -piperazine affords the basic ether 10 . Alkylation of this intermediate with a-chloro-o-xylene gives chlorbenzoxamine ll .6 CHC1 NaOCH2CH2N _ NH - gt CHOCH2CH2 NH When the additional nitrogen atom is included in one of the aromatic rings, on the other hand, there is obtained a...
Arylacetic and Arylpropionic Acids
Organic compounds that share some feature of structure or functionality often exhibit similar biologic effects. Thus, although I he arylalkylamines differ in pharmacologic profile, their effects I end to be those which are mediated via the autonomic or central nervous system. The arylacetic and arylpropionic acids by contrast show no such common targets. It is of note in this connec- I ion that, unlike the corresponding amines, these acids find few structural counterparts among endogenous...
Phenethyl and Phenylpropylamines
By the turn of the century the theory of chemical mediation of physiologic responses had gained some currency. There ensued in some laboratories an intense search for endogenous chemical modifiers of bodily responses-. The first such agent to be isolated from mammalian tissue was the ubiquitous hormone, epinephrine at that time known as adrenaline. This compound has played an important role in pharmacology as well as in medicinal chemistry. In the former, a study of this molecule has gone far...