A Simple Synthesis of Polyfunctionalized 4-Aminopyrazolidin-3-ones as ‘Aza-deoxa’ Analogs of<scp>D</scp>-Cycloserine
作者:Ana Novak、Matej Štefanič、Uroš Grošelj、Martina Hrast、Marta Kasunič、Stanislav Gobec、Branko Stanovnik、Jurij Svete
DOI:10.1002/hlca.201300169
日期:2014.2
A simple five‐step synthesis of fully substituted (4RS,5RS)‐4‐aminopyrazolidin‐3‐ones as analogs of D‐cycloserine was developed. It comprises a two‐step preparation of 5‐substituted (4RS,5RS)‐4‐(benzyloxycarbonylamino)pyrazolidin‐3‐ones, reductive alkylation at N(1), alkylation of the amidic N(2) with alkyl halides, and simultaneous hydrogenolytic deprotection/reductive alkylation of the primary NH2