描述了通过使用中间体(三甲基甲硅烷基)甲基烯丙醇来合成手性,非外消旋丁二烯基羰基醇。通过在催化量的CrCl 3或CrCl 2存在下用(4-溴丁-2-炔基)三甲基硅烷处理醛来获得烯丙醇。合成了几种新的三齿双(恶唑啉基)咔唑配体,并将其评估为手性来源。手性烯丙醇的合成可以实现良好的收率(58-88%)和对映选择性(55-78%ee)。可用TBAF或2 M HCl处理烯丙醇,以43-86%的收率提供所需的二烯。或者,当用N-碘代琥珀酰亚胺处理时,(三甲基甲硅烷基)甲基烯丙醇提供碘丁二烯基甲醇。
Asymmetric Synthesis of (1,3-Butadien-2-yl)methanols from Aldehydes via [1-(Silylmethyl)allenyl]methanols
作者:María Durán-Galván、Brian T. Connell
DOI:10.1002/ejoc.201000199
日期:2010.5
[1-(Silylmethyl)allenyl]methanols 2 were efficiently synthesized fromaldehydes and (4-bromobut-2-ynyl)trimethylsilane in the presence of a catalytic amount of CrCl 2 and tridentate carbazole ligands. The desired compounds were obtained with good yields (43-88%) and enantioselectivities (55-78 % ee). Alcohols 2 may be treated with TBAF or 2 M HCl in the case of aliphatic substrates, to provide (1,