Synthesis of thyroid hormone analogues. Part 1. Preparation of 3′heteroarylmethyl-3,5-di-iodo-<scp>L</scp>-thyronines via phenol–dinitrophenol condensation and relationships between structure and selective thyromimetic activity
作者:Paul D. Leeson、John C. Emmett
DOI:10.1039/p19880003085
日期:——
3′-Heteroarylmethyl analogues (1)–(8) of the natural thyroid hormone 3,3′,5-tri-iodo-L-thyronine (T3) were synthesized as potential selective (cardiac-sparing) thyromimetics. The diphenyl ether moiety was constructed by condensation of 3-substituted 4-methoxyphenols with a 3,5-dinitro-L-tyrosine derivative. Synthesis of the key phenols (28)–(32) required the in situ preparation, at low temperatures
合成了天然甲状腺激素3,3',5-tri- iodo - L -thyronine(T 3)的3'-杂芳基甲基类似物(1)-(8)作为潜在的选择性(保心脏)甲状腺素。通过使3-取代的4-甲氧基苯酚与3,5-二硝基-L-酪氨酸衍生物缩合来构建二苯醚部分。关键酚(28)-(32)的合成需要在低温下原位制备新型金属化物种2-lithio-5-methoxypyrididine(14),5-lithio-2-methoxypyrimidine(15),5 -硫代-2-甲基吡啶(16),5-溴-4-硫代-2-甲氧基吡啶(18)和2,6-二氟-3-硫代吡啶(19),然后与苯甲醛(20)反应。从苄基溴(33)开发出了哒嗪酮(36)和噻唑酮(37)苯酚的替代途径。结构-活性关系表明,选择性吡啶反应与2-氧杂戊基-5-基甲基3'-取代有关,如在吡啶酮(1),哒嗪酮(2),羟基吡啶(4)和噻唑酮(8)中发现的