Lewis Base Activation of Lewis Acids: Catalytic, Enantioselective Addition of Glycolate-Derived Silyl Ketene Acetals to Aldehydes
作者:Scott E. Denmark、Won-jin Chung
DOI:10.1021/jo8006539
日期:2008.6.1
A catalytic system involving silicon tetrachloride and a chiral, Lewis basic bisphosphoramide catalyst is effective for the addition of glycolate-derived silyl ketene acetals to aldehydes. It was found that the sense of diastereoselectivity could be modulated by changing the size of the substituents on the silyl ketene acetals. In general, the trimethylsilyl ketene acetals derived from methyl glycolates
A Unified Strategy for the Asymmetric Synthesis of Highly Substituted 1,2-Amino Alcohols Leading to Highly Substituted Bisoxazoline Ligands
作者:Bijay Shrestha、Brennan T. Rose、Casey L. Olen、Aaron Roth、Adon C. Kwong、Yang Wang、Scott E. Denmark
DOI:10.1021/acs.joc.0c02899
日期:2021.2.19
A general procedure for the asymmetric synthesis of highly substituted 1,2-amino alcohols in high yield and diastereoselectivity is described that uses organometallic additions of a wide range of nucleophiles to tert-butylsulfinimines as the key step. The addition of organolithium reagents to these imines follows a modified Davis model. The diastereoselectivity for this reaction depends significantly
Highly enantio- and diastereoselective boron aldol reactions of α-heterosubstituted thioacetates with aldehydes and silyl imines
作者:Cesare Gennari、Anna Vulpetti、Gilles Pain
DOI:10.1016/s0040-4020(97)00251-2
日期:1997.4
Boron enolates derived from α-heterosubstituted thioacetates and bearing menthone-derived chiral ligands react with aldehydes to give anti aldols with excellent diastero- and enantiocontrol. Boron enolates derived from tert-butyl α-halothioacetate and bearing menthone-derived chiral ligands react with imines with excellent diastero- and enantiocontrol to give syn α-halo-β-aminothioesters, which can
[EN] 1,4-DISUBSTITUTED ISOQUINILONE DERIVATIVES AS RAF-KINASE INHIBITORS USEFUL FOR THE TREATMENT OF PROLIFERATIVE DISEASES<br/>[FR] DERIVES D'ISOQUINILONE 1,4-DISUBSTITUES EN TANT QU'INHIBITEURS DE RAF-KINASE UTILES POUR LE TRAITEMENT DE MALADIES PROLIFERANTES
申请人:NOVARTIS AG
公开号:WO2005028444A1
公开(公告)日:2005-03-31
This invention relates to compounds of formula (I) wherein the variable substituents are described herein. The compounds are useful for the treatment of conditions and diseases characterized by an aberrant MAP kinase signaling pathway, such as cancer.
Concise Synthesis of the <i>neo</i>-Clerodane Skeleton of Teucrolivin A Using a Pericyclic Reaction Cascade
作者:Steve Arns、Louis Barriault
DOI:10.1021/jo052052i
日期:2006.3.1
Herein, we describe the synthesis of advanced intermediate 39 on the path towards the total synthesis of teucrolivin A (3) in 16 steps from commercially available 1,3-cyclohexadiene. We have constructed the trans-decalin core of the natural product 3 as a single diastereomer using a tandem oxy-Cope/Claisen/ene cascade and in doing so have incorporated sufficient functionality to allow completion of