Ester derived titanium enolate aldol reaction: chelation controlled diastereoselective synthesis of syn -aldols
作者:Arun K Ghosh、Jae-Hun Kim
DOI:10.1016/s0040-4039(00)02227-9
日期:2001.2
A chelation controlled and highly diastereoselective synthesis of syn-aldols is described. Aldol reaction of commercially available l-phenylalaninol derived esters with a variety of bidentate oxyaldehydes proceeded with excellent syn-diastereoselectivities and isolated yields.
Transition-State Mimetics for HIV Protease Inhibitors: Stereocontrolled Synthesis of Hydroxyethylene and Hydroxyethylamine Isosteres by Ester-Derived Titanium Enolate Syn and Anti-Aldol Reactions
作者:Arun K. Ghosh、Steve Fidanze
DOI:10.1021/jo980159i
日期:1998.9.1
the aminoalkyl epoxides 10 and 15 as well as the gamma-lactone 17 was assembled by our recently developed highly selective ester-derivedtitaniumenolatealdolreactions. The Ti-enolate of 6 reacted with (benzyloxy)acetaldehyde and cinnamaldehyde to provide the syn-aldol product 7 and anti-aldol product 12, respectively. Removal of the chiral template followed by Curtius rearrangement of the resulting
Asymmetric Aldol Route to Hydroxyethylamine Isostere: Stereoselective Synthesis of the Core Unit of Saquinavir
作者:Arun K. Ghosh、Khaja Azhar Hussain、Steve Fidanze
DOI:10.1021/jo9706943
日期:1997.8.1
Ester derived titanium enolate aldol reaction: Highly diastereoselective synthesis of syn- and anti-aldols
作者:Arun K. Ghosh、Steve Fidanze、Masanobu Onishi、Khaja Azhar Hussain
DOI:10.1016/s0040-4039(97)01765-6
日期:1997.10
Aldolreactions of bidentate aldehydes and cis-1-arylsulfonamido-2-indanyl ester derived titanium enolates proceed with excellent syn-diastereoselectivities and good to excellent isolated yields.
Synthesis, reactivity and conformational stability of an l-phenylalanine derived oxadiazinanone
作者:Delvis D. Dore、James R. Burgeson、Ryan A. Davis、Shawn R. Hitchcock
DOI:10.1016/j.tetasy.2006.09.002
日期:2006.9
An L-phenylalanine derived oxadiazinanone bearing an isopropyl group at the N-4-position was prepared and acylated with either hydrocinnamoyl or propanoyl chloride. These oxadiazinanones were utilized in titanium-mediated asymmetric aldol reactions with aromatic and aliphatic aldehydes. The diastereoselectivities observed from these reactions ranged from fair to very good and suggested that the N-4-isopropyl-L-phenylalanine based oxadiazinanones are conformationally and configurationally stable at the N-4-nitrogen. (c) 2006 Elsevier Ltd. All rights reserved.