An efficient synthesis of symmetrical and unsymmetrical proline-type diketopiperazines using a phosphite-promoted coupling was used to generate diketopiperazines with overall good yields from unprotected amino acids.
All-<i>cis</i> Saturated 2,5-Diketopiperazines by a Diastereoselective Rhodium-Catalyzed Arene Hydrogenation
作者:Christian H. Schiwek、Christian Jandl、Thorsten Bach
DOI:10.1021/acscatal.2c00400
日期:2022.3.18
perform a highly diastereoselective arene hydrogenation of symmetric 2,5-DKPs catalyzed by a rhodium complex. Twenty-eight saturated pentacyclic 2,5-DKPs were obtained in high yields with exquisite diastereoselectivities, exhibiting the hydrogen atoms in an all-cis arrangement. The high tolerance toward functional groups and the compatibility with existing stereogenic centers are key features of the transformation
Facile synthesis and spectroscopic elucidation of 4,11-bis(dehydroxy)-bipolaroamide
作者:Manuel Jainta、Martin Nieger、Stefan Bräse
DOI:10.1016/j.molstruc.2008.12.073
日期:2009.3
diketopiperazine revealed further evidence that the phosphite-promoted coupling used is free of racemization or inversion. These stereochemical results are important for this advanced reaction and may lead to a key step in the total synthesis of many natural products. The dimerized 2-indoline carboxylic acid described herein was chosen to be a model system for structure and reaction studies on route to the favored
通过人工2-二氢吲哚羧酸的轻松缩合形成新的二酮哌嗪。这种高度结晶的化合物通过 NMR 光谱以及 X 射线晶体学表征。新的五环二酮哌嗪的光谱数据揭示了所使用的亚磷酸酯促进偶联没有外消旋化或反转的进一步证据。这些立体化学结果对于这种高级反应很重要,并可能导致许多天然产物全合成的关键步骤。选择本文所述的二聚化的 2-二氢吲哚羧酸作为结构和反应研究的模型系统,用于对首选 rostratines 的途径。
SOMEI, MASANORI;KAWASAKI, TOSHIYA, CHEM. AND PHARM. BULL., 37,(1989) N2, C. 3426-3428
作者:SOMEI, MASANORI、KAWASAKI, TOSHIYA
DOI:——
日期:——
The First and Simple Synthesis of Indole Alkaloid, Bipolaramide
作者:Masanori Somei、Toshiya Kawasaki
DOI:10.3987/com-95-s21
日期:——
The first and simple total synthesis of bipolaramide was achieved in 31% overall yield from (2S)-2,3-dihydroindole-2-carboxylic acid in three (or two) steps. Derivatives of bipolaramide having halogen, alkenyl, nitro, or azido substituents were also prepared.