1H-1,3-Benzazaphospholes: The Organometallic Route and a New Three-Step Synthesis with Reductive Ring Closure
作者:Raj K. Bansal、Neelima Gupta、Joachim Heinicke、George N. Nikonov、Farida Saguitova、Dinesh C. Sharma
DOI:10.1055/s-1999-3394
日期:1999.2
Primary and N-secondary 2-phosphanylanilines were synthesized via metallation of 2-bromoanilines, coupling with ClP(NMe2)2, alcoholysis and reduction with LiAlH4, and subsequently reacted with formimidoester hydrochloride to give 1,3-benzazaphospholes. For 1H-1,3-benzazaphospholes, a shorter alternative three-step synthesis was developed, based on N-acylation of 2-bromoaniline, NiCl2-catalyzed arylation of triethyl phosphite and a new reductive cyclization of amidophosphonic acid este with excess LiAlH4.
主要和N-次级2-磷胺基苯胺通过2-溴苯胺的金属化反应、与ClP(NMe2)2偶联、醇解以及用LiAlH4还原合成,并随后与甲酰亚胺酯盐酸盐反应生成1,3-苯并氮杂膦。对于1H-1,3-苯并氮杂膦,开发了一种更短的替代三步合成方法,基于2-溴苯胺的N-酰化、NiCl2催化的三乙基磷酸酯芳基化,以及用过量LiAlH4进行的新型还原环化反应。