Large-scale synthesis of 1,1,3,3,6-pentamethyl-1,3-disilaindan-5-ol via a CoBr2/Zn-catalyzed [2+2+2] cycloaddition reaction
作者:Ryo Mizojiri、Richard Conroy、Jürgen Daiss、Etsuo Kotani、Reinhold Tacke、David Miller、Louise Walsh、Tetsuji Kawamoto
DOI:10.1016/j.tet.2010.07.068
日期:2010.9
3-disilaindan-5-ol (2) is a key intermediate in the synthesis of new sila-substituted gonadotropin releasing hormone receptor antagonists, such as 1. In order to produce sufficient quantities of 1 for pharmacological and toxicological evaluation, an efficient synthesis of 2 has been developed. (1,1,3,3,6-Pentamethyl-1,3-disilaindan-5-yl)methanal (11) was synthesized in a one-pot procedure. CoBr2/Zn-catalyzed [2+2+2]
1,1,3,3,6-Pentamethyl-1,3-disilaindan-5-ol(2)是合成新的sila取代的促性腺激素释放激素受体拮抗剂的关键中间体,例如1。为了产生足够数量的1用于药理和毒理学评估,已经开发了2的有效合成方法。以一锅法合成了(1,1,3,3,6-五甲基-1,3-二硅丙丹-5-基)甲缩醛(11)。通过将3和CoBr 2缓慢加入到CoBr 2 / Zn催化的[2 + 2 + 2]环中,将二炔3与市售单炔15进行环加成反应。15和锌粉在回流的乙腈中,生成5-(二乙氧基甲基)-1,1,3,3,3,6-五甲基-1,3-二硅氢化茚(14)。原位水溶液酸化产生11。然后通过Baeyer-Villiger氧化转化为2,然后在碱性条件下水解。这种新颖的方法是有用的,不仅对快速,大规模合成2,也为合成和衍生自新硅杂取代的药物的开发11。