Practical and Scalable Synthesis of a Selective CCK<sub>1</sub> Receptor Antagonist
作者:Christopher M. Mapes、Neelakandha S. Mani、Xiaohu Deng、Chennagiri R. Pandit、Kelly J. McClure、Marna C. W. Pippel、Clark A. Sehon、Laurent Gomez、Shirin Shinde、J. Guy Breitenbucher、Todd K. Jones
DOI:10.1021/jo1017684
日期:2010.11.19
antagonist. Notable features of this concise route are (1) a regioselective construction of the pyrazole core through the reaction of an aryl hydrazine and an elaborated acetylenicketone, (2) a Tf2O/pyridine mediated Z-selective dehydration of an α-hydroxyester, and (3) a stereoselective hydrolysis. The sequence is high-yielding and amenable for large-scale synthesis.
我们描述了一种实用的和可扩展的途径,以化合物(Z)-1,选择性CCK 1受体拮抗剂。此简洁途径的显着特征是:(1)通过芳基肼与精细的炔酮反应形成吡唑核的区域选择性结构;(2)Tf 2 O /吡啶介导的α-羟基酯的Z选择性脱水; (3)立体选择性水解。该序列产量高并且适合大规模合成。
Catalyst-controlled switchable phosphination of α-diazoesters
Organocatalyst and metal provide different products: a catalyst-controlled switchable phosphination of α-diazoesters has been developed by using DBU and copper as catalysts. It provided an efficient synthetic method for the construction of various phosphorus compounds via the formation of NâP and CâP bonds.