diastereoselective method was developed for the [2,3]-sigmatropic rearrangement of N-allyl ammonium ylides, affording products in up to 95% isolated yields and up to 97:3 dr; most of the desired products were formed within 1 minute. For the asymmetric reaction, a chiral auxiliary was introduced to the starting compound, affording the rearrangement product with high diastereoselectivities. A rapid and diastereoselective
PROCESSES FOR THE PREPARATION OF O-[5-(4-AMINO-THIAZOL-2-YL)-PYRIDIN-2-YLMETHYL]-HYDROXYLAMINE
申请人:Tang Datong
公开号:US20090281324A1
公开(公告)日:2009-11-12
The present invention relates generally to novel methods for the synthesis of O-[5-(4-amino-thiazol-2-yl)-pyridin-2-ylmethyl]-hydroxylamine which is an essential reagent in the synthesis of one of the bridged erythromycin derivatives and their respective pharmaceutically acceptable salts in PCT Application WO 03/097659 A1. In particular, the present invention relates to processes and intermediates for the preparation of a compound of formula (Ia):
Processes for the preparation of O-[5-(4-amino-thiazol-2-yl)-pyridin-2-ylmethyl]-hydroxylamine
申请人:Enanta Pharmaceuticals, Inc.
公开号:US07842813B2
公开(公告)日:2010-11-30
The present invention relates generally to novel methods for the synthesis of O-[5-(4-amino-thiazol-2-yl)-pyridin-2-ylmethyl]-hydroxylamine which is an essential reagent in the synthesis of one of the bridged erythromycin derivatives and their respective pharmaceutically acceptable salts in PCT Application WO 03/097659 A1. In particular, the present invention relates to processes and intermediates for the preparation of a compound of formula (Ia):
Coupling of α-bromoamides and unactivated alkenes to form γ-lactams through EDA and photocatalysis
作者:Sean M. Treacy、Daniel R. Vaz、Syed Noman、Cédric Tard、Tomislav Rovis
DOI:10.1039/d2sc05973h
日期:——
methods for the synthesis of this valuable motif, previous redox approaches to γ-lactam synthesis from α-haloamides and olefins require additional electron withdrawing functionality as well as N-aryl substitution to promote electrophilicity of the intermediate radical and prevent competitive O-nucleophilicity about the amide. Using α-bromo imides and α-olefins, our strategy enables the synthesis of monosubstituted