Microwave-Assisted Stereoselective One-Pot Synthesis of Symmetrical and Unsymmetrical 2,5-Diketopiperazines from Unprotected Amino Acids
作者:Manuel Jainta、Martin Nieger、Stefan Bräse
DOI:10.1002/ejoc.200800605
日期:2008.11
The facile condensation of unprotected aminoacids by a phosphite-promoted one-step coupling reaction is a highly efficient synthesis to generate stereoselective and optically pure symmetrical and unsymmetrical functionalized diketopiperazines. The use of microwaves enhanced by small amounts of ionic liquid is accompanied by significant improvement in reaction times and yields. Simple filtration through
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
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.