Dramatic reversal of diastereoselectivity in an N-acyliminium ion cyclization leading to hexahydropyrrolo[2,1-a]isoquinolines. A case of competing steric interactions
Experimental and Theoretical Investigation of the Enantiomerization of Lithium α-tert-Butylsulfonyl Carbanion Salts and the Determination of Their Structures in Solution and in the Crystal
作者:Roland Scholz、Gunther Hellmann、Susanne Rohs、Gerhard Raabe、Jan Runsink、Diana Özdemir、Olaf Luche、Thomas Heß、Alexander W. Giesen、Juliana Atodiresei、Hans J. Lindner、Hans-Joachim Gais
DOI:10.1002/ejoc.201000409
日期:2010.8
and [R 1 C(R 2 )SO 2 Ph]Li ˙ 2diglyme [R 1 = R 2 = Me, Et; R 1 -R 2 = = (CH 2 )5] showed them to be O-Li contact ion pairs (CIPs). The monomers and dimers have a C α -S conformation in which the lone-pair orbital at the C α atom bisects the O-S-O angle and a significantly shortened C α -S bond. The C α atom of [R 1 C(R 2 )SO 2 R 3 ]Li·L n (R' = Ph; R 3 = Ph, tBu) is planar, whereas the C α atom of
SPHINGOSINE KINASE INHIBITORS AND METHODS OF THEIR USE
申请人:Smith D. Charles
公开号:US20070032531A1
公开(公告)日:2007-02-08
The invention relates to compounds, pharmaceutical compositions thereof, and methods for inhibiting sphingosine kinase and for treating or preventing hyperproliferative disease, inflammatory disease, or angiogenic disease,
作者:Kaikai Wang、Yajun Li、Xiaoyan Li、Daliang Li、Hongli Bao
DOI:10.1021/acs.orglett.1c03355
日期:2021.11.19
The first iron-catalyzed asymmetric azidation of benzylic peresters has been reported with trimethylsilyl azide (TMSN3) as the azido source. Hydrocarbon radicals that lack of strong interactions were capable to be enantioselectively azidated. The reaction features good functional group tolerance, high yields, and mild conditions. The chiral benzylic azides can further be used in click reaction, phosphoramidation
Process for the preparation of 4-tert-butylbenzaldehyde
申请人:IMI (TAMI) INSTITUTE FOR RESEARCH & DEVELOPMENT LTD.
公开号:EP0580231A1
公开(公告)日:1994-01-26
In a process for the preparation of 4-tert-butylbenzaldehyde in high yield and purity a) 4-tert-butyltoluene is brominated using bromine and without a solvent, to obtain a mixture consisting essentially of 4-tert-butylbenzalbromide and 4-tert-butylbenzylbromide; and b) the mixture obtained in step (a) is reacted with water and a Sommelet reagent, optionally in the presence of a co-solvent, to obtain the desired product.
MECHANISM OF C–H INSERTION OF CARBENE IN RIGID MATRIX
作者:Hideo Tomioka、Yasuji Ozaki、Yasuji Izawa
DOI:10.1246/cl.1982.843
日期:1982.6.5
C–Hinsertion process of phenylchlorocarbene, a ground state singletcarbene, is not affected by matrix which generally exerts its effect in C–Hinsertion of most arylcarbenes. This reveals the origin of the matrix effects on carbene reactions.