A Convergent Synthesis of Hexahomotriazacalix[3]arene Macrocycles
摘要:
A new, convergent synthesis of hexahomotriazacalix[3] arenes la-e is described. The key transformation in this synthesis involves the coupling of the triamines 4a-d with 2,6-bis(chloromethyl)-4-methylphenol 5 and results in the formation of the hexahomotriazacalix[3] arenes 1a-d in 90-95% yield. The triamines 4a-d were constructed by the one-pot reaction of monochloroaldehyde 3 and a primary amine followed by reduction to yield the triamines 4a-d in 50-55% yield. Deallylation of macrocycle Id was accomplished by palladium catalysis to obtain the N-unsubstituted macrocycle le, which has the potential to be a precursor to a variety of N-substituted hexahomotriazacalix[3] arenes.
were synthesized. Among these macrocyclic compounds, RC4 was determined to be the most appropriate candidate to replace BPA as the developer material used in thermochromic dyes. In tests of prepared thermochromic dyes, RC4 had results similar to those of BPA, achieving the best protonation/deprotonation equilibria and providing a dark contrast with the thermochromic dye. DFT calculations also showed
The reaction between 2,6-bis(hydroxylmethyl)-4-methylphenol and benzylamine afforded N,N',N''-tribenzyl-6,15,24-trimethyl-9,18,27-trihydroxy-2,11,20-triaza[3.3.3]metacyclophanes.
A Convergent Synthesis of Hexahomotriazacalix[3]arene Macrocycles
作者:Panadda Chirakul、Philip D. Hampton、Zsolt Bencze
DOI:10.1021/jo001094y
日期:2000.12.1
A new, convergent synthesis of hexahomotriazacalix[3] arenes la-e is described. The key transformation in this synthesis involves the coupling of the triamines 4a-d with 2,6-bis(chloromethyl)-4-methylphenol 5 and results in the formation of the hexahomotriazacalix[3] arenes 1a-d in 90-95% yield. The triamines 4a-d were constructed by the one-pot reaction of monochloroaldehyde 3 and a primary amine followed by reduction to yield the triamines 4a-d in 50-55% yield. Deallylation of macrocycle Id was accomplished by palladium catalysis to obtain the N-unsubstituted macrocycle le, which has the potential to be a precursor to a variety of N-substituted hexahomotriazacalix[3] arenes.