Comparative studies about the hydroamination of unactivatedalkenes and dienes catalyzed by either cationic gold(I) triphenyl phosphite complexes or silver salts were performed using sulfonamides, anilines and carbamates as nucleophiles. Gold-catalyzed reactions generally, need lower loadings than those carried out with silver salts. Simple alkenes react only with sulfonamides and weak aromatic amines
(Triphenyl phosphite)gold(I)-Catalyzed Intermolecular Hydroamination of Alkenes and 1,3-Dienes
作者:Xavier Giner、Carmen Nájera
DOI:10.1021/ol801104w
日期:2008.7.17
sulfonamides to alkenes and conjugated dienes can be carried out using a low loading of (triphenyl phosphite)gold(I) chloride and silver triflate as a catalytic mixture. The reaction can be performed under conventional thermal or microwave conditions and at rt in the case of dienes. Terminal alkenes undergo regioselective hydroamination at the internal carbon atom and dienes at the less substituted double bond
Calcium-Catalyzed Direct Amination of π-Activated Alcohols
作者:Stefan Haubenreisser、Meike Niggemann
DOI:10.1002/adsc.201000768
日期:2011.2.11
A calcium-catalyzed direct amination of π-activated alcohols with different nitrogen nucleophiles under very mild reaction conditions is presented. The high reactivity of the calcium catalyst allows for an efficient conversion of secondary and tertiary benzylic and allylic as well as tertiary propargylic alcohols. Nitrogen nucleophiles such as carbamates, tosylamides and anilines are readily alkylated
<i>cis</i>- and <i>trans</i>-Stereoselective Epoxidation of N-Protected 2-Cyclohexen-1-ylamines
作者:Peter O'Brien、Amanda C. Childs、Gareth J. Ensor、Cheryl L. Hill、Jonathan P. Kirby、Michael J. Dearden、Sally J. Oxenford、Clare M. Rosser
DOI:10.1021/ol035873n
日期:2003.12.1
The first systematic study of the cis and trans stereoselectivity in the m-CPBA epoxidation of N-protected cyclic allylic amines has been completed. Mono-N-protected systems gave epoxides with cis stereochemistry (amides are better cis directors than sulfonamides or carbamates) whereas di-N-protected systems gave trans-epoxides (TsNBoc protection gave complete trans stereoselectivity). [structure: