In Situ Alcohol Oxidation-Wittig Reactions Using Non-stabilised Phosphoranes
作者:Leonie Blackburn、Chengxin Pei、Richard J. K. Taylor
DOI:10.1055/s-2002-19755
日期:——
New procedures have been developed which allow the in situ alcohol oxidation-Wittig reaction using manganese dioxide to be employed with non-stabilised phosphoranes and stabilised phosphonate anions. A number of examples are described utilising benzylic, allylic and propargylic alcohols.
bidentate phospholane and phosphinite ligands based on a benzothiophene scaffold. The ligand functions in the bidentate ligands can be introduced independently and consecutively. A bis-phospolane ligand as well as its rhodium complex have been characterized by crystal-structure determinations. The bis-phospholane ligands were tested in the catalysed asymmetric homogeneous hydrogenation of dehydroamino
A Simple Synthesis of Polyfunctionalized 4-Aminopyrazolidin-3-ones as ‘Aza-deoxa’ Analogs of<scp>D</scp>-Cycloserine
作者:Ana Novak、Matej Štefanič、Uroš Grošelj、Martina Hrast、Marta Kasunič、Stanislav Gobec、Branko Stanovnik、Jurij Svete
DOI:10.1002/hlca.201300169
日期:2014.2
A simple five‐step synthesis of fully substituted (4RS,5RS)‐4‐aminopyrazolidin‐3‐ones as analogs of D‐cycloserine was developed. It comprises a two‐step preparation of 5‐substituted (4RS,5RS)‐4‐(benzyloxycarbonylamino)pyrazolidin‐3‐ones, reductive alkylation at N(1), alkylation of the amidic N(2) with alkyl halides, and simultaneous hydrogenolytic deprotection/reductive alkylation of the primary NH2