Synthesis of Functionalized Diketopiperazines as Cyclotryprostatin and Tryprostatin Analogues
摘要:
Various ketopiperazines were synthesized as (cyclo) tryprostatin analogues. Construction of the skeleton started with a Pictet-Spengler reaction followed by acylation or alkylation of the piperidine nitrogen and condensation with a primary amine. 2-Chloroacetyl tetrahydro-beta-carbolines rearranged towards the corresponding 2-chloro-N-[2-(1H-indol-3-yl)ethyl]acetamide derivatives upon treatment with NBS. These compounds were cyclized with primary amines towards the corresponding functionalized diketopiperazines.