Microwave-promoted and Lewis acid catalysed synthesis of steroidal A- and D-ring fused 4,6-diarylpyridines
作者:Mandakini Dutta、Pallabi Saikia、Sanjib Gogoi、Romesh C. Boruah
DOI:10.1016/j.steroids.2013.01.006
日期:2013.4
The preparation of novel steroidal heterocycles containing 4,6-diaryl substituted pyridine moiety fused to the 2,3- and 16,17-positions of the steroid nucleus is described. The Michael reaction of steroidal ketones (1a, 1b and 1c) with in situ generated chalcones provided the intermediates 3,5-diaryl-1,5-dicarbonyl steroidal derivatives (4a-s). Subsequently, the intermediates 4a-s were converted to
描述了含有与类固醇核的 2,3- 和 16,17- 位稠合的 4,6-二芳基取代的吡啶部分的新型类固醇杂环的制备。甾体酮(1a、1b 和 1c)与原位生成的查耳酮的迈克尔反应提供了中间体 3,5-二芳基-1,5-二羰基甾体衍生物(4a-s)。随后,中间体4a-s通过与尿素在BF3.OEt2作为催化剂的存在下在微波辐射下的固相反应转化为吡啶衍生物(5a-s)。所有合成的杂甾体都是新化合物,目前正在对其生物活性进行评估。