作者:Nan Zheng、Joseph D. Armstrong、Kan K. Eng、Jennifer Keller、Tom Liu、Robert Purick、Joseph Lynch、Frederick W. Hartner、R.P. Volante
DOI:10.1016/j.tetasy.2003.09.022
日期:2003.11
Described herein is a convergent asymmetric synthesis of growth hormone secretagogue (GHS) suitable for large-scale preparations. Key features include: (1) an improved method for α-iodination of a lactam; (2) a novel synthesis of a disubstituted urea using Ti(Oi-Pr)4 and NaBH4; (3) construction of biphenyl ureas via an unprecedented Suzuki coupling; (4) an in situ mesylation/N-alkylation of a benzolactam
本文描述了适合大规模制备的生长激素促分泌素(GHS)的收敛性不对称合成。主要特征包括:(1)一种改进的内酰胺α-碘化方法;(2)使用Ti(O i -Pr)4和NaBH 4新颖合成二取代尿素;(3)通过史无前例的Suzuki偶联剂构建联苯脲;(4)苯并内酰胺的原位甲磺酸化/ N-烷基化。