作者:Shiv Kumar Sharma、Suseela Kanamathareddy、C. David Gutsche
DOI:10.1055/s-1997-1359
日期:1997.11
The mono- (5a), bis- (4a and 4b), and tetrakis (1a)-p-cyanomethylcalix[4]arenes as well as the bis(cyanomethyl)calix[6]arene (6a) have been transformed both by acid and base induced hydrolysis to the corresponding p-carboxymethylcalix[4]arenes 5b, 4c, 4d, 2a, and 6b which, in turn, were converted to the methyl (5c, 4e, 4f, 2b) and ethyl (5d, 4g, 2c) esters. The cyanomethyl groups in the sterically hindered compounds 7 and 8 and their corresponding monomers 10 and 11, however, were inert to hydrolysis, even under strenuous conditions. The methyl ester 2b can be converted to the 1,3-dibenzyl ether (3b) and the 1,3-dibenzoate (3c) as well as the tetrabenzyl ether (3a) and tetrabenzoate (3d).
单取代(5a)、双取代(4a 和 4b)以及四取代(1a)对位氰基甲基卡利克斯[4]芳烃和双(氰基甲基)卡利克斯[6]芳烃(6a)经过酸和碱诱导的水解反应,转化为相应的对位羧基甲基卡利克斯[4]芳烃(5b、4c、4d、2a 和 6b),而这些产物又进一步转化为甲酯(5c、4e、4f、2b)和乙酯(5d、4g、2c)。然而,立体障碍化合物 7 和 8 及其对应的单体 10 和 11 中的氰基甲基在严格条件下对此反应表现出惰性,未能发生水解。甲酯 2b 可转化为 1,3-二苄基醚(3b)、1,3-二苄酸酯(3c)、四苄基醚(3a)和四苄酸酯(3d)。