Highly Diastereoselective and General Synthesis of Primary β-Fluoroamines
摘要:
A short, high yielding protocol has been developed for the highly diastereoselective (dr >20:1) and general synthesis of primary beta-fluoroamines by the enantioselective alpha-fluorination of aldehydes, conversion into the N-sulfinyl aldimlne, nucleophilic addition of various organometallic species, and 1 degrees amine liberation.
通过无环硫代氨基缩醛前体的S N 2样环化合成了在C2'-位带有氟的核苷类似物。该策略提供了进入两个支架的途径,d -1',2'-顺式-呋喃呋喃糖苷和d -1',2'-反式呋喃糖苷,使用标准的核苷合成方法难以产生。在模型C2氟化的二硫缩醛底物上添加甲硅烷基化的核碱基会导致1,2-顺式非对映选择性,这与C2-F和S一致-烷基部分非常接近。还使用这种方法合成了一系列带有C3'全碳四元中心以及C2'–F原子的类似物,并正在研究其潜在的抗代谢物。
Aldol Reactions between L-Erythrulose Derivatives and Chiral α-Amino and α-Fluoro Aldehydes: Competition between Felkin-Anh and Cornforth Transition States
作者:Santiago Díaz-Oltra、Miguel Carda、Juan Murga、Eva Falomir、J. Alberto Marco
DOI:10.1002/chem.200800956
日期:2008.10.20
Both matched and mismatched diastereoselection have been observed in aldolreactions of a boronenolate of a protected L-erythrulose derivative with several chiral alpha-fluoro and alpha-amino aldehydes. Strict adherence to the Felkin-Anh model for the respective transitionstructures does not account satisfactorily for all the observed results, as previously observed in the case of alpha-oxygenated
Organomediated Enantioselective
<sup>18</sup>
F Fluorination for PET Applications
作者:Faye Buckingham、Anna K. Kirjavainen、Sarita Forsback、Anna Krzyczmonik、Thomas Keller、Ian M. Newington、Matthias Glaser、Sajinder K. Luthra、Olof Solin、Véronique Gouverneur
DOI:10.1002/anie.201506035
日期:2015.11.2
The first organomediated asymmetric 18F fluorination has been accomplished using a chiral imidazolidinone and [18F]N‐fluorobenzenesulfonimide. The method provides access to enantioenriched 18F‐labeled α‐fluoroaldehydes (>90 % ee), which are versatile chiral 18F synthons for the synthesis of radiotracers. The utility of this process is demonstrated with the synthesis of the PET (positron emission tomography)
Highly diastereoselective synthesis of enantioenriched <i>anti</i>-α-allyl-β-fluoroamines
作者:Philip J. Chevis、Sirilak Wangngae、Thanaphat Thaima、Anthony W. Carroll、Anthony C. Willis、Mookda Pattarawarapan、Stephen G. Pyne
DOI:10.1039/c9cc02765c
日期:——
A highly diastereoselectivesynthesis of anti-α-allyl-β-fluoroamines has been developed involving enantioselective α-fluorination of aldehydes followed by a diastereoselective Petasis allyl borono-Mannich reaction. The products are obtained generally in good overall yields for the two steps and with drs of 97 : 3–99 : 1 and ees of 86–92%. Selected products were converted to 3-, 5- and 6-membered ring
Crystallization-Induced Dynamic Resolution of Fox Chiral Auxiliary and Application to the Diastereoselective Electrophilic Fluorination of Amide Enolates
efficient crystallization-induced dynamic resolution (CIDR) of trans-Fox (fluorinated oxazolidine) chiral auxiliary is reported. This chiral auxiliary was used for highly diastereoselective (>98% de) electrophilic fluorination of amideenolates. After removal of the chiral auxiliary, highly valuable enantiopure α-fluorocarboxylic acids and β-fluoroalcohols are obtained.