Synthesis of 1,3-Amino Alcohols from 2-Aza-1,3-dienes by Reduction of 5,6-Dihydro-2<i>H</i>-1,3-oxazines
作者:José Barluenga、Jesús Joglar、Francisco J. González、Santos Fustero、Carl Krüger、Y. -H. Tsay
DOI:10.1055/s-1991-26473
日期:——
5,6-Dihydro-2H-1,3-oxazines 3, prepared from 2-aza-1,3-dienes 4, react with sodium in 2-propanol, giving tetrahydro-2H-1,3-oxazines 5. The acid hydrolysis of 5 leads to 1,3-amino alcohols 6 with three stereocenters. The reduction of 3 with lithium aluminum hydride affords N-alkyl derivatives of 1,3-amino alcohols 7 with four stereocenters. The stereochemistry of these compounds was established by X-ray crystallography of (4S*,5S*,6R*)-5-methyl -4,6-diphenyl-3-[(1R*)-1-phenylpropyl]tetrahydro-2H-1,3-oxazine (8).
5,6-二氢-2H-1,3-恶嗪3,由2-氮杂-1,3-二烯4制备,与钠在2-丙醇中反应,得到四氢-2H-1,3-恶嗪5。 5的水解产生具有三个立构中心的1,3-氨基醇6。用氢化铝锂还原3得到具有四个立构中心的1,3-氨基醇的N-烷基衍生物7。这些化合物的立体化学是通过(4S*,5S*,6R*)-5-甲基-4,6-二苯基-3-[(1R*)-1-苯基丙基]四氢-2H-的X射线晶体学确定的1,3-恶嗪(8)。