A Novel Solid-Phase Synthetic Method for 1,4-Benzodiazepine-2,5-dione Derivatives
作者:Moon-Kook Jeon、Jeong-Jin Kwon、Myung-Su Kim、Young-Dae Gong
DOI:10.1055/s-2008-1078484
日期:——
Utilizing polymer-bound anthranilic acid derivatives 1, we were able to obtain the 1,4-benzodiazepine-2,5-dione derivatives 3 (R3 = H, R4 = H, MeO, Cl) through an unprecedented reaction sequence, reductive alkylation-N-protected amino acid coupling-deprotective cyclization, in 28-71% five-step overall isolated yields and 95-99% purities from Wang resin 4. Applying the novel protocol to the resin 2, the 7-benzamido-1,4-benzodiazepine-2,5-dione derivatives 3 (R1 = Bn, R4 = 7-BzNH) could be obtained in 19-42% seven- or eight-step overall isolated yields and 92-98% purities from AMEBA resin 7.
利用与聚合物结合的蒽酸衍生物 1,我们通过前所未有的反应序列,即还原烷基化-N-保护性氨基酸偶联-保护性环化反应,得到了 1,4-苯并二氮杂卓-2,5-二酮衍生物 3(R3 = H,R4 = H,MeO,Cl),五步法的总分离产率为 28-71%,纯度为 95-99%。对树脂 2 采用新方案,可获得 7-苯甲酰胺基-1,4-苯并二氮杂卓-2,5-二酮衍生物 3(R1 = Bn,R4 = 7-BzNH),其在 AMEBA 树脂 7 中的七步或八步分离收率为 19-42%,纯度为 92-98%。