26254-89-7Relevant articles and documents
Crossed Regio- and Enantioselective Iron-Catalyzed [4+2]-Cycloadditions of Unactivated Dienes
Braconi, Elena,Cramer, Nicolai
supporting information, (2021/12/22)
The cyclohexene motif is ubiquitous in nature and specialty chemicals. A straightforward selective access to chiral cyclohexenes from unactivated dienes and dienophiles is not feasible by classical Diels–Alder reaction and constitutes an unsolved syntheti
Total synthesis and structural verification of some novel branched alkanes with quaternary carbons isolated from diverse geological sources
Crich, David,Xu, Huadong,Kenig, Fabien
, p. 5016 - 5019 (2007/10/03)
With a view to the authentication of an unusual series of branched alkanes with quaternary centers (BAQCs) isolated from geological samples, and whose structures rest on the interpretation of EI-mass spectral fragmentation patterns, the total synthesis of 3-ethyl-3-methylheptadecane, 3,3-dimethylheptadecane, 3,3,11,11-tetraethyltridecane, and 5,5,7,7- tetraethylundecane is described. The GC-MS data of the first two samples are identical with those of the isolates and confirm their structures. However, the GC-MS data of the two more highly branched structures do not match those of the geological isolates leading to the conclusion that these structures were erroneously assigned.
Chiral Synthesis via Organoboranes. 34. Selective Reductions. 47. Asymmetric Reduction of Hindered α,β-Acetylenic Ketones with B-Chlorodiisopinocampheylborane to Propargylic Alcohols of Very High Enantiomeric Excess. Improved Workup Procedure for the Isol
Ramachandran, P. Veeraraghavan,Teodorovic, Aleksandar V.,Rangaishenvi, Milind V.,Brown, Herbert C.
, p. 2379 - 2386 (2007/10/02)
The Midland reagent, Alpine-Borane (2a), is excellent for the asymmetric reduction of many acetylenic ketones but it fails with hindered derivatives.On the other hand, B-chlorodiisopinocampheylborane (DIP-Chloride, 4) reacts with hindered α,β-acetylenic k
