Synthesis of Enantiomerically Enriched Triarylmethanes by Enantiospecific Suzuki–Miyaura Cross-Coupling Reactions
摘要:
The Suzuki-Miyaura cross-coupling of chiral, enantiomerically enriched dibenzylic boronic esters is described. The reaction proceeds with almost complete retention of stereochemistry, providing access to triaryl-methanes, compounds that have high biological activity and are difficult to prepare in enantiomerically pure form using other methods.
Quantitative Data on the Effects of Alkyl Substituents and Li–O and Li–N Chelation on the Stability of Secondary α-Oxy-Organolithium Compounds
作者:Pablo Monje、Paula Graña、M. Rita Paleo、F. Javier Sardina
DOI:10.1002/chem.200600864
日期:2007.3.5
more sterically hindered organolithiumcompounds. Alkyl groups adversely affect the stability of organolithiumcompounds when attached to the carbon bearing the negative charge, but the extent of this effect is highly dependent on the nature of the rest of the substituents attached to the anionic center. Quantitative data on the stabilization imparted to organolithiumcompounds by Li-O and Li-N chelation
Synthesis of enantiomerically enriched β-amino alcohol derivatives via asymmetric lithiation of O-benzyl carbamates–imine addition using (−)-sparteine complexes
作者:Sonia Arrasate、Esther Lete、Nuria Sotomayor
DOI:10.1016/s0957-4166(02)00078-2
日期:2002.3
The asymmetric lithiation of O-benzyl carbamates–imine addition sequence using sec-butyllithium/(−)-sparteine complexes has been studied. The reactions proceed with high diastereoselectivity, giving the threo β-amino alcohol derivatives with modest to good e.e. The best enantioinduction was obtained with O-benzyl carbamates bearing methoxy substituents on the aromatic ring.
Synthesis of Enantiomerically Enriched Triarylmethanes by Enantiospecific Suzuki–Miyaura Cross-Coupling Reactions
作者:Smitha C. Matthew、Ben W. Glasspoole、Patrick Eisenberger、Cathleen M. Crudden
DOI:10.1021/ja412159g
日期:2014.4.23
The Suzuki-Miyaura cross-coupling of chiral, enantiomerically enriched dibenzylic boronic esters is described. The reaction proceeds with almost complete retention of stereochemistry, providing access to triaryl-methanes, compounds that have high biological activity and are difficult to prepare in enantiomerically pure form using other methods.
A 1,3-boron shift reaction of homoallenylboronates to synthesise 2-boryl-1,3-dienes
We describe a 1,3-boron shift-type reaction of homoallenylboronates at the center (sp) carbon in allenes to afford 2-boryl-1,3-dienes with a variety of substituents.