A one-pot reduction-transimition-reduction synthesis of N-substituted β-ethanolamines from cyanohydrins
作者:Peter Zandbergen、Adrianus M.C.H. van den Niewendijk、Johannes Brussee、Arne van der Gen、Chris G. Kruse
DOI:10.1016/s0040-4020(01)88477-5
日期:1992.1
An efficient (74% – 97% yield) three-step one-pot synthesis of (R)-Halostachine and analogues from O-protected optically active cyanohydrins is described. The reaction sequence involves a DIBAL reduction of the nitrile to an imine, transimination to a secondary imine and sodium borohydride reduction to the corresponding N-substituted β-ethanolamine. Both O-protected as well as unprotected reaction
描述了一种有效的(74%– 97%的收率)三步一锅合成法,由O保护的旋光性氰醇合成(R)-海洛沙汀及其类似物。反应顺序包括将腈进行DIBAL还原为亚胺,将氨基磺酸酯化为仲亚胺,然后将硼氢化钠还原为相应的N-取代的β-乙醇胺。既可以得到O-保护的反应产物,也可以得到未保护的反应产物。