The first stereoselective Pd-catalyzed addition of boronic acids onto aldehydes
摘要:
The coupling reaction between 2-p-totylsulfinyl benzaldehyde and substituted boronic acids catalyzed by Pd-2(dba)(3)center dot CHCL3 proceeds in a stereoselective manner, demonstrating the efficiency of the sulfinyl group as a chiral inductor. Enantiopure secondary diaryl alcohols become easily accessible by subsequent sulfoxide-lithium exchange. (C) 2007 Elsevier Ltd. All rights reserved.
The first stereoselective Pd-catalyzed addition of boronic acids onto aldehydes
摘要:
The coupling reaction between 2-p-totylsulfinyl benzaldehyde and substituted boronic acids catalyzed by Pd-2(dba)(3)center dot CHCL3 proceeds in a stereoselective manner, demonstrating the efficiency of the sulfinyl group as a chiral inductor. Enantiopure secondary diaryl alcohols become easily accessible by subsequent sulfoxide-lithium exchange. (C) 2007 Elsevier Ltd. All rights reserved.
Asymmetric [2,3]-Wittig Rearrangement: Synthesis of Homoallylic, Allenylic, and Enynyl α-Benzyl Alcohols
作者:Ricardo I. Rodríguez、Elsie Ramírez、José A. Fernández-Salas、Rubén Sánchez-Obregón、Francisco Yuste、José Alemán
DOI:10.1021/acs.orglett.8b03659
日期:2018.12.21
A highly stereoselective [2,3]-Wittig rearrangement of allylic and propargylic ethers controlled by a chiral sulfoxide moiety is presented. The activation provided by the sulfoxide at the remote ortho position allows the rearrangement of less-activated and unexplored benzylic carbanions. Thus, this general methodology gives access to the asymmetric synthesis of homoallylic, enynyl, and allenylic α-benzyl
Influence of an ortho-sulfinyl group on the configurational stability of α-lithiated aryloxiranes: deuteration of tolylsulfinyl styrene oxides
作者:Vito Capriati、Saverio Florio、Renzo Luisi、Antonio Salomone、Maria Giovanna Tocco、Ana M. Martín Castro、José Luis García Ruano、Esther Torrente
DOI:10.1016/j.tet.2008.10.021
日期:2009.1
and stereoselectivity of the deuteration reactions of substituted styrene oxides has been investigated. The sulfinyl group at an ortho-position reduces the configurational stability of α-lithiated styrene oxides, whereas meta- and para-sulfinyl derivatives completely control the regioselectivity only yielding deuterated products at the aromatic ring due to its strong ortho-director effect.
Remote stereocontrol by the sulfinyl group. Diels–Alder reaction of cyclopentadiene with substituted (S)-[2-(p-tolylsulfinyl)styrenes and (S)-[2-(p-tolylsulfinyl)phenyl] vinyl ketones
作者:M. Carmen Maestro、José Antonio Fernández-Salas、José L. García Ruano、Oney O. Ramírez-Rodríguez、Ramiro Araya-Maturana
DOI:10.1016/j.tet.2012.03.112
日期:2012.6
a homochiral sulfinyl group at the dienophile to act as a remote stereocontrol inductor in the Diels–Alder reaction with cyclopentadiene has been evaluated. High pressure conditions were required for the reactions of (S)-2-(p-tolylsulfinyl)styrenes 3–5 (E-1,2-disubstituted doublebond) and 6–8 (1,1-disubstituted doublebond). A good facialselectivity and total endo selectivity were attained with 1
Organocatalytic asymmetric deoxygenation of sulfones to access chiral sulfinyl compounds
作者:Shengli Huang、Zhen Zeng、Nan Zhang、Wenling Qin、Yu Lan、Hailong Yan
DOI:10.1038/s41557-022-01120-x
日期:2023.2
incorporation of a cyano group into the sulfone generates a chiral sulfinic species as an active intermediate. A wide range of chiral sulfinates with highenantioselectivities could then be acquired using alcohols as nucleophiles, and the subsequent transformations allowed the collective preparation of a variety of chiral sulfinyl compounds. Density functional theory calculations revealed that the catalytic cycle
Stereoselective Quaternization of α-Amino Phenylacetonitriles Mediated by a Remote Sulfinyl Group
作者:José Luis García Ruano、Ana M. Martín-Castro、Francisco Tato、Inés Alonso
DOI:10.1021/jo0705519
日期:2007.8.1
Enantiomerically pure alpha-substituted alpha-amino phenylacetonitriles have been readily prepared from 2-p-tolylsulfinylbenzaldimines following a two-step sequence: a moderately stereoselective hydrocyanation of the imines and a completely stereoselective quaternization of the resulting diastereoisomeric mixture of alpha-amino phenylacetonitriles with different alkylating or acylating reagents in the presence of KHMDS. Theoretical calculations support a stereoselectivity control exerted by the remote sulfinyl group, as long as it is responsible for the conformational preferences of the benzyllithium intermediates, which suffer the attack of the electrophiles to the less hindered diastereotopic face.