T-butyl cascade polymers
A method for forming cascade polymers specifically utilizing the amine monomer of the formula The monomer is made by initially reacting nitromethane and CH 2 ═CHCO 2 —TBu by nucleophilic addition to form the triester nitrotrialkanoate of the formula and then reducing the nitrosubstituent to afford the said amine monomer.
1. A method of forming a one-directional arborol of the formula
wherein R is t-Bu by the steps of
treating adamantanecarbonyl chloride with di-tert-butyl 4-amino-[2-tert-butoxy-carbonyl)ethyl]-heptanedioate (amine monomer) to form a triester of the formula
wherein R is t—Bu;
hydrolyzing said triester to a triacid; and
performing peptide coupling of additional amine monomers to each of the acid moieties of said triacid to form said arborol.
2. A method as set forth in claim 1 wherein said step of treating adamantanecarbonyl chloride is conducted in the presence of NEt 3 and C 6 H 6 at about 25° C. for about 20 hours.
3. A method as set forth in claim 1 wherein said step of hydrolyzing said triester is conducted in the presence of 96% HCO 2 H at about 25° C. for about 20 hours.
4. A method as set forth in claim 1 wherein said step of performing peptide coupling is conducted in the presence of DCC, 1-hydroxybenzotriazole, and dimethylformamide at about 25° C. for about 24 hours.
5. A method of forming a four-directional spherical dendritic macromolecule by the steps of treating an acid chloride of the formula
with an amine monomer, di-tert-butyl 4-amino-[2-tert-butoxycarbonyl)ethyl]heptanedioate, to form a dodecaester of the formula
wherein R is t—Bu and adding additional layers of amine monomer by repeatedly hydrolyzing the ester, coupling the amine monomer to the acid moieties to form an additional tier of ester moieties and hydrolyzing to a corresponding acid.
6. A compound of the formula
wherein R 1 , R 2 , R 3 , and R 4 , are selected from the group consisting of hydrogen and cascade arborol branches, at least one of said R 1 , R 2 , R 3 , and R 4 being a cascade arborol branch, wherein said branch is derived from the amine monomer di-tert-butyl 4-amino-[2-tert-butoxycarbonyl)ethyl]heptanedioate.
7. A compound of claim 6 of the formula
wherein R is t—Bu or H.
8. A compound as set forth in claim 6 of the formula
wherein R is t—Bu or H.
9. A compound of the formula
wherein R is t—Bu or H.
10. A compound of the formula
wherein R is t—Bu or H.