Diastereoselective addition of organolithiums to 1,3-oxazolidines complexed with aluminum tris(2,6-diphenylphenoxide) (ATPH)
作者:Takayasu Yamauchi、Hiroyuki Sazanami、Yuuichi Sasaki、Kimio Higashiyama
DOI:10.1016/j.tet.2004.12.036
日期:2005.2
condensation of N-substituted (R)-phenylglycinol with aldehydes. Addition of organolithium reagents to 1,3-oxazolidines by complexation with the bulky Lewis acid aluminum tris(2,6-diphenylphenoxide) (ATPH) readily produced the corresponding chiral amines with good yield and high diastereoselectivity. The configuration of the new stereogenic center was shown to be opposite to that of adducts obtained for
通过使N-取代的(R)-苯基甘氨醇与醛缩合,可以容易地获得1,3-氧唑烷。通过与庞大的路易斯酸三(2,6-二苯基苯氧基)铝(ATPH)络合,将有机锂试剂添加到1,3-恶唑烷中,可以轻松地以高收率和高非对映选择性生产相应的手性胺。新的立体生成中心的构型与使用格氏试剂对相同的1,3-恶唑烷获得的加合物的构型相反。使用N-异丙基-1,3-恶唑烷可实现最佳的非对映选择性。通过NOE实验确定亚胺-铝配合物的立体化学推导了加成机理。