作者:Scott E. Denmark、Jung-Ho Kim
DOI:10.1055/s-1992-34183
日期:——
A large-scale and practical synthesis of (dl)-1,3-diphenyl-1,3-propanediamine (1) has been achieved by a highly diastereoselective phenylcerium dichloride addition to 1-tert-butoxycarbonyl-4,5-dihydro-5-phenylpyrazole (3). Alkylcerium addition reaction to the corresponding 5-alkyl substituted 1-Boc-4,5-dihydropyrazoles was less satisfactory mainly giving ring-cleaved products. Further elaboration of the diamine 1 to the N-substituted derivatives 8a-f bearing N-methyl, N-ethyl, N-isopropyl, N-neopentyl, N-benzyl, and N-mesitylmethyl groups is described.
通过高度对映选择性的苯基铈二氯化物对1-叔丁氧羰基-4,5-二氢-5-苯基吡唑(3)的加成反应,成功实现了外消旋1,3-二苯基-1,3-丙二胺(1)的大规模实用合成。将烷基铈加成反应应用于相应的5-烷基取代的1-Boc-4,5-二氢吡唑时,效果不佳,主要得到环裂解产物。此外,还描述了将二胺1进一步衍生化为N-取代衍生物8a-f的过程,这些衍生物带有N-甲基、N-乙基、N-异丙基、N-新戊基、N-苄基和N-三甲基甲基基团。