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Патент USA US3073836

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3,73,3Zh
Patented Jan. 15, 1%63
1
3,073,826
S-PYRROLIDYLMETHYL=4-QUINAZOLONES
Homer C. Scarborough, Evansville, Ind., assignor to Mead
Johnson & Company, Evansville, Ind., a corporation of
Indiana
No Drawing. Filed Oct. 20, 1960, Ser. No. 63,734
11 Claims. (Cl. Mil-256.4)
This invention relates to new compositions of matter
and, more particularly, to 3-pyrrolidylmethyl-4-quinazo
The above equation shows the reaction of acetanthranil
10 with l-lower alkyl-3-pyrrolidylmethylamine to form 2
substituted-3-(1-lower alkyl-3-pyrrolidylmethyl ) -4-quin
lones, the acid addition salts thereof, and processes for
preparing the same.
azolone, wherein R1, R2 and R3 are as previously de?ned.
Alkyl groups defined by R2 preferably contain up to 3
7
The compounds of this invention have the following
structural formula:
0
carbon atoms.
In another embodiment of this invention 3-(1-lower
15
alkyl-3-pyrrolidylmethyl)~4-quinazolone may be prepared
by reacting substantially equimolar amounts of isotoic
Rs
\ limit \
Ny R:
N/
anhydride and l-lower alkyl-S-pyrrolidylrnethylamine.
The initial step of the reaction may be carried out by
20
1
wherein R1 is a lower alkyl, preferably containing up
heating the reactants, isotoic anhydride and pyrro1idyl~
methyl-amine, in a solvent under substantially anhydrous
conditions to form a pyrrolidylmethylanthranilamide as
an intermediate, The completion of the formation of
the intermediate is determined by the cessation of gas
to about 6 carbon atoms; R2 is selected from the group 25 (carbon dioxide) evolution. One preferred solvent for
this step is an alcohol, such as ethanol. The intc1'medi—
consisting of hydrogen and lower alkyl, such as methyl,
ate product is then reacted with an organic acid, such
ethyl and propyl; and R3 is selected from the group con
as formic acid, preferably with heating, to produce the
sisting of hydrogen and halogen, wherein the halogen is
desired product. In lieu of formic acid, organic acids of
preferably selected from the group consisting of chlorine
and bromine. The nontoxic, pharmacologically accept 30 the formula R2-COOI-l may be used, wherein R2 is as
previously de?ned. Re?uxing is a convenient mode of
able, therapeutically active acid addition salts of these
carrying out this step of the process.
Halogenated isotoic anhydrides used as starting ma—
terials in lieu of isotoic anhydride per se may be pre
The compounds of the present invention have valuable
therapeutic and pharmacological properties and are par 35 pared by well known methods using halogenated an
thanilic acid as a starting material.
ticularly useful as anti-in?ammatory agents. They may
The acid addition salts of the compounds of this inven
be administered orally in the form of tablets, capsules, or
compounds are also contemplated as part of this inven
tion.
tion may be prepared by conventional procedures. Ex
in a suitable liquid vehicle, such a syrup or an elixir, and
emplary of some useful nontoxic, pharmacologically ac
40 ceptable salts are the hydrochlorides, hydrobromides, ace
milligrams per kilogram of body weight per day.
tates, mucates, tartrates, sulfates and the like.
The compounds of this invention may be prepared by
The following examples will illustrate the preparation
the reaction of a l-lower alkyl-3-pyrrolidylmethylamine
of the compounds of this invention.
with a compound selected from the group consisting of
The starting materials, acetanthranil and haloacetan
‘anthranils, halogenated anthranilsor isotoic anhydrides.
thranil, used in the synthesis of certain of the compounds
Hydrocarbon solvents, such as toluene, xylene and the
the preferred dosage for mammals is about 1 to about 3
45
like, are useful reaction media. In one embodiment of
this invention, 2-lower alkyl-3-(1-lower alkyl-3-pyrrolidyl
of this invention, were prepared as follows:
A. Acetanthranil
One hundred three grams ‘(0.75 mole) of anthranilic
methyl)-4-quinazolone may be prepared by heating a mix
ture of equimolar amounts of l-lower alkyl-3-pyrrolidyl
methylamine with an anthranil in a solvent, such as t0l~ 50 acid were added portionwise over a period of 15 minutes
to 213 milliliters (2.25 mole) of acetic anhydride main
uene. To prepare the corresponding halogenated quinaz
tained at 120-130" C. in a 500 milliliter three-necked
flask equipped with magnetic stirrer, thermometer and
clone of this embodiment, a halogenated anthranil,
such as, for example, chloroacetanthranil, is substituted
in the process as a starting material in lieu of acetan- '
Claissen head attached to a condenser. The addition was
described reaction:
collected. The residue was ?ltered hot and diluted with
500 milliliters of isopropyl ether. Cooling gave a buff
colored solid which was dried in vacuo over phosphorus
thranil.
The following equation illustrates the above 55 slightly exothermic. The ?ask was then heated until 160
milliliters of distillate (boiling point 116-124° C.) were
EQUATION I
60
Ra“
pentoxide. The solid was suspended in 600 milliliters of
hot isopropyl ether and an insoluble sludge removed by
?ltration. The liquor was treated with Nuchar activated
charcoal, and cooled to furnish 90 grams, or an 80%
yield of acetanthranil having a melting point of 7 8-8l° C.
3,073,828
4
B. 6-C/1loroacetanlhranil
The reaction of 17.2 grams (0.1 mole) of 2-amino-5
chlorobenzoic acid and 30 milliliters of acetic anhydride
gave, after recrystallizations from benzene-isopropyl
ether, 17.5 grams of 6-chloroacetanthranil, having a melt
ing point of 118—124° C.
compositions prepared by procedures illustrated in the
foregoing examples. The compound of Example III was
prepared by the procedure of Example II. The com
pounds of Examples IV through VII were prepared by
the procedure of Example I. The starting material for
Examples VI and VII was 6-chloroacetanthranil.
TABLE I.~3-PYRROLIDYLMETHYL~4-QUINAZOLONES
EXAMPLE I
2-Methyl-3- (I-Etlzyl-3-Pyrr0lidylmethyl) ~4-Quinazolone
Di/zydrochloride
RP‘
A solution of 8.1 grams (0.05 mole) of acetanthranil
)1
N-OH
LR,
in 60 milliliters of dry toluene was added to a stirred solu
N/
l
tion of 7.7 grams (0.06 mole) of 1-ethyl-3-pyrrolidyl
methylamine. The mixture was stirred under re?ux with
concurrent separation of Water for 22 hours, during which 15
78% of the theoretical Water separated. The solution
containing some tarry material Was diluted with 200 mil
Melting Purl
Exam- R;
R;
R;
Point,
0021Salt
liliters of ether, washed with 5% sodium hydroxide, and
ple
° .
tionl
then extracted with dilute hydrochloric acid. The acid
(dam)
extracts were combined, washed with ether, and basi?ed
with concentrated aqueous sodium hydroxide. The aque
III-_.._ C2135 H
H
133-135 b-c
Dlhydrochloride.
IV.... __ CH:
OH;
H
177-179 a—d
Heminnucate.
ous mixture was extracted with four 70 milliliter portions
V_____ __ CH3
OH:
H
232-240 c-e
Dihydrochloride.
VI ____ _. CH3
H3
01
244-250 8-1'
D0.
of chloroform, and the combined chloroform solutions
VII_.._- C2115 CH5
Cl
208-211 g~ceh Monohydro were washed with water and dried. Concentration of
chloride.
the chloroform furnished 12.7 grams of an oil. The oil
was dissolved in 50 milliliters of absolute ethanol, and
1 The letters appearing in this column refer to the solvents from which
the products were recrystallized, as follows:
100 milliliters of butanone and two equivalents of al
(0) ethanol; (12) isopropanol; (c) absolute ethanol; ((1) water; (e) buta
coholic hydrogen chloride were added to furnish 11 grams
none; (I) methanol; (9) acetonitrile; (h) ether.
of a butt solid, having a melting point of 236-239" C.
While several particular embodiments of this invention
The solid was dissolved in 100 milliliters of methanol and 30
are shown above, it will be understood, of course, that
150 milliliters of butanone were added. The solution was
the invention is not limited thereto, since many modi?ca
boiled with the addition of butanone to maintain a constant
tions may be made, and it is contemplated, therefore,
volume until a solid separated. Cooling gave 10.5 grams
by the appended claims, to cover any such modi?cations
of a butt solid, having a melting point of 247-250" C. The
as fall within the true spirit and scope of this invention.
melting point was unchanged upon recrystallization from
I claim:
absolute ethanol. Analysis by ultraviolet absorption in
.
1. A compound selected from the group consisting of
a compound of the formula:
317 mu, 305 mu, 275 mu, 267 mu and 228 mu; e=3,270,
4,200, 7,200, 7,570 and 28,900.
EXAMPLE II
3-(] ~MetlzyI-3-Pyrrolidylmethyl) -4-Quinaz0lone
Dihydrochloride
A mixture of 8.2 grams (0.05 mole) of isotoic an
hydride and 5.7 grams (0.05 mole) of l-methyl-B-pyr 45
rolidylmethylamine in 75 milliliters of absolute ethanol
wherein R1 is lower alkyl, R2 is selected from the group
was re?uxed, the reaction being accompanied by vigorous
consisting of hydrogen and lower alkyl, and R3 is selected
gas evolution and solution of the reactants. The resultant
from
the group consisting of hydrogen and halogen and
solution was concentrated in vacuo to a syrupy residue
nontoxic pharmacologically acceptable therapeutically
which was again re?uxed with 75 milliliters of formic acid 50 the
active acid addition salts thereof.
for 3 hours. The solution was then concentrated in vacuo,
2. 2-lower alkyl~3-(1-lower alkyl-3-pyrrolidylmethyl)
and the residue mixed with chipped ice and made strongly
4-qu1'nazolone.
alkaline with 40% sodium hydroxide. The oily mixture
3. 3-(1~lower alkyl-3-pyrrolidylmethyl)-4-quinazolone.
was extracted with 175 milliliters of chloroform, and the (a Cl
4. 2-lower alkyl-3-(1-lower alkyl-3-pyrrolidylmethyl)
chloroform solution was washed with brine and dried over
chloro-4~quinazolone.
magnesium sulfate. Eleven and four-tenths grams of oil
5. 3-(1-l0wer alkyl-3-pyrrolidylmethyl)-chloro-4-quin
were obtained upon concentration of the chloroform, the
azolone.
oil was dissolved in absolute ethanol-butanone, and two
6. 3-( 1methyl-3-pyrrolidylmethyl) -4-quinazolone.
equivalents of ethanolic hydrogen chloride were added
7. 3-(1-ethyl-3-pyrrolidylmethyl)-4-quinazolone.
portionwise during which addition a solid separated. A 60
8.
2 - methyl-3-(1-methyl-3-pyrrolidylmethyl)-4-quin
product yield of 12.5 grams or 79% resulted. The melt
azolone.
ing point of the product varied with the amount of sample
9. 2 - methyl-3-(1-ethyl-3-pyrrolidylmethyl)-4-quinaz0
and rate of heat, and after recrystallization from ethanol
lone.
at small sample melted at 218~220° C. using very slow
heating. Analysis by ultraviolet absorption in 0.1 nor
10. 2-methyl-3-( 1-methyl-3-pyrrolidylmethyl) ~6-chlor0
a 4-quinazolone.
mal sodium hydroxide gave the following values: A==
314 mu, 302 mu, 275 mu, 266 mu and 238 mu; e=2,530,
3,160, 5,430, 5,650 and 22,600.
11. 2 - methyl-3-( 1-ethyl-3-pyrrolidylmethyl)~6-chloro
4-quinazolone.
The 3-(1-ethyl-3-pyrrolidylmethyl) derivatives con
templated by this invention may be prepared in a manner 70
similar to the above compound.
The following table illustrates the properties of further
References Cited in the ?le of this patent
Baker et a1.: J. Org. Chem, Volume 17, pages 35-36
(1952).
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