Gold-catalyzed intramolecular hydroamination of allenes: a case of chirality transfer
作者:Nitin T. Patil、Léopold Mpaka Lutete、Naoko Nishina、Yoshinori Yamamoto
DOI:10.1016/j.tetlet.2006.04.087
日期:2006.7
The hydroamination of allenes proceeded smoothly in the presence of gold catalysts to give the corresponding 2-vinyl pyrrolidines and piperidines in high yields. The reaction is very efficient and can be carried out with only 1–5 mol % catalyst at room temperature and under extremely mild conditions. As an example of chirality transfer, it is shown that aminoallene 1a (96% ee), synthesized from (S)-(−)-1-octyn-3-ol
Palladium-Catalyzed Intramolecular Hydroamination of Allenes Coupled to Aerobic Alcohol Oxidation
作者:Shuifa Qiu、Yunyang Wei、Guosheng Liu
DOI:10.1002/chem.200802381
日期:2009.3.9
Taking the air! A PdII‐catalyzed intramolecular hydroamination of allenes coupled to alcohol oxidation has been developed. This reaction is performed by using a nitrogen‐based ligand under aerobic conditions, under which the molecular oxygen is used as the terminal oxidant for the reoxidation of Pd0 species to complete the catalyticcycle.
Biosynthesis of tetraponerine-6. Evidence that two different pathways are operating in the biosynthesis of the two tetraponerine skeletons
作者:C. Devijver、J. C. Braekman、D. Daloze、J. M. Pasteels
DOI:10.1039/a608180k
日期:——
Evidence is presented showing that tetraponerine-6 2a from
Tetraponera sp. ants is biosynthesized from two molecules of
putrescine and a seven-carbon moiety coming from an eight-carbon
polyacetate chain through decarboxylation, in contrast with
tetraponerine-8 1a, which derives from one putrescine unit and a
twelve-carbon polyacetate precursor.