ARYL TERPENE ESTERS
The present disclosure is directed to novel derivatives of terpenes, particularly aryl ester derivatives of terpene alcohols, and methods of making them, compositions comprising them, and methods for using them.
1 . A UV-absorbing terpene alcohol ester compound of the general formula (I):
in free or salt form, wherein A is the core of a terpene alcohol or derivative thereof, and wherein B is selected from a bond, —CH 2 —, —CH═CH, and —(CH═CH) m , wherein m is an integer from 2 to 10, and wherein the phenyl ring is optionally substituted by zero to five substituents R, each of which is independently selected from:
C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, C 1 -C 12 alkoxy, C 2 -C 12 alkenyloxy, C 2 -C 12 alkynyloxy, C 5 -C 20 aryloxy, acyl (including C 2 -C 12 alkylcarbonyl (—CO-alkyl) and C 6 -C 20 arylcarbonyl (—CO-aryl)), acyloxy (—O-acyl), C 2 -C 12 alkoxycarbonyl (—(CO)—O-alkyl), C 6 -C 20 aryloxycarbonyl (—(CO)—O-aryl), C 2 -C 12 alkylcarbonato (—O—(CO)-O-alkyl), C 6 -C 2 arylcarbonato (—O—(CO)—O-aryl), carboxy (—COOH), carboxylato (—COO − ), carbamoyl (—(CO)—NH 2 ), mono-N-substituted C 1 -C 12 alkylcarbamoyl (—(CO)—NH(C 1 -C 12 alkyl)), di-N-substituted alkylcarbamoyl (—(CO)—N(C 1 -C 12 alkyl) 2 ), mono-N-substituted arylcarbamoyl (—(CO)—NH-aryl), halo (—F, —Cl, —Br, or —I), hydroxy (—OH), cyano (—C≡N), amino (—NH 2 ), mono- and di-N—(C 1 -C 12 alkyl)-substituted amino, mono- and di-N—(C 5 -C 20 aryl)-substituted amino, C 2 -C 12 alkylamido (—NH—(CO)-alkyl), C 5 -C 20 arylamido (—NH—(CO)-aryl), imino (—CR a ═NH where R a is selected from hydrogen, C 1 -C 12 alkyl, C 5 -C 20 aryl, C 6 -C 20 alkaryl, C 6 -C 20 aralkyl, etc.), alkylimino (—CR b ═N(alkyl), wherein R b is selected from hydrogen, alkyl, aryl, alkaryl, etc.), arylimino (—CR c ═N(aryl), where R c is selected from hydrogen, alkyl, aryl, alkaryl, etc.), nitro (—NO 2 ), C 1 -C 12 alkylsulfonyl (—SO 2 -alkyl), and C 5 -C 20 arylsulfonyl (—SO 2 -aryl);
wherein each of the aforementioned hydrocarbyl moieties of the preceding substituents, such as C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, and C 5 -C 20 aryl, are each independently optionally further substituted as provided herein;
provided that A is not a core of dihydrocitronellol when B is —CH═CH— and the phenyl ring is unsubstituted; and
provided that A is not a core tetrahydrolinalool when B is —CH═CH— and the phenyl ring is unsubstituted; and
provided that A is not a core tetrahydrolinalool when B is a bond and the phenyl ring is solely ortho-substituted with a hydroxy group;
provided that A is not a core hexahydrofarnesol when B is —CH═CH— and the phenyl ring is unsubstituted.
2 . The compound of claim 1 , wherein A is the core of a terpene alcohol, or derivative thereof, wherein said terpene is a monoterpene, sesquiterpene, diterpene, sesterterpene, or triterpene.
3 . The compound of claim 1 , wherein A is the core of a terpene alcohol, or derivative thereof, wherein said terpene alcohol is selected from citronellol, isocitronellol, geraniol, nerol, menthol, myrcenol, linalool, thymol, a-terpineol, b-terpineol, g-terpineol, borneol, farnesol, nerolidol, and carotol.
4 . The compound of claim 3 , wherein said terpene alcohol is selected from citronellol, myrcenol, linalool, and farnesol.
5 . The compound of claim 1 , wherein said terpene alcohol, or derivative thereof, is fully saturated (e.g., said terpene alcohol is a fully saturated monoterpene derivative, e.g., an isodecyl moiety).
6 . The compound of claim 1 , wherein A is selected from the group consisting of:
7 . The compound of claim 1 , wherein B is a bond.
8 . The compound of claim 1 , wherein B is —CH═CH.
9 . The compound of claim 1 , wherein group A is an isodecyl group, e.g., selected from 2,4-dimethyloctan-2-yl, 2,6-dimethyl-octan-1-yl, 2,6-dimethyloctan-2-yl, 3,7-dimethyloctan-1-yl, and 3,7-dimethyloctan-3-yl, and optionally wherein group B is —CH═CH—Ph, 2-hydroxy-1-phenyl, or 2-acetoxy-l-phenyl.
10 . The compound of claim 1 , wherein the compound is selected from the group consisting of:
11 . A method of making the compound of any one of claims 1 - 10 , wherein the method comprises the step of reacting a compound of the Formula A, with a compound of Formula B, or an ester, activated ester or acyl halide thereof, in a condensation reaction to form the compound of Formula I:
wherein substituents A, B and R, are as defined in claim 1 .
12 . The method of claim 11 , wherein the reaction comprises a mixture of sulfuric acid and magnesium sulfate, optionally in a hydrocarbon solvent, such as heptane.
13 . The method of claim 11 , wherein the reaction comprises adding a solid magnesium sulfate/sulfuric acid adduct as catalyst to a mixture of the compound of Formula A and the compound of Formula B, optionally without an additional solvent.
14 . A composition comprising a compound according to claim 1 , optionally in admixture with one or more pharmaceutically acceptable, cosmetically acceptable, or industrially acceptable excipients or carriers, for example, solvents, oils, surfactants, emollients, diluents, glidants, abrasives, humectants, polymers, plasticizer, catalyst, antioxidant, coloring agent, flavoring agent, fragrance agent, antiperspirant agent, antibacterial agent, antifungal agent, hydrocarbon, stabilizer, or viscosity controlling agent.