Silenes as novel synthetic reagents: synthesis of diols and lactones from simple alkyldienes
摘要:
Aryl substituted silenes can be generated by a modified Peterson olefination reaction and trapped in situ to afford silacycles with high diastereoselectivity. These silacycles can be elaborated by 'Fleming-Tamao' type oxidation to provide access to functionalized diols and lactones. (C) 2003 Elsevier Ltd. All rights reserved.
Allylboronic Esters as Acceptors in Radical Addition, Boron 1,2-Migration, and Trapping Cascades
作者:Kalipada Jana、Armido Studer
DOI:10.1021/acs.orglett.2c00039
日期:2022.2.4
Radical 1,3-carboheteroarylation and 1,3-hydroalkylation of allylboronic esters comprising a 1,2-boron shift is reported. Allylboronic esters are generally used in synthesis as allylation reagents, where the boronic ester moiety gets lost. In the introduced cascades, alkylboronic esters are obtained with the boron entity remaining in the product. The carboheteroarylation of the allylboronic esters
Antibiotics of the ostreogrycin complex. Part II. Structure of ostreogrycin A
作者:G. R. Delpierre、F. W. Eastwood、G. E. Gream、D. G. I. Kingston、P. S. Sarin、Lord Todd、D. H. Williams
DOI:10.1039/j39660001653
日期:——
Structure (XXIII) is suggested for ostreogrycin A, an antibiotic produced by the soil organism Streptomyces ostreogriseus. Acid hydrolysis of “perhydro A,” prepared by complete hydrogenation of the antibiotic, yields inter alia 4,6-dimethyl-γ-heptanolactone, DL-alanine, proline, and 10-amino-7-methyl-δ-dec-2-enolactone. Ozonolysis of the antibiotic with oxidative working-up yields glycine and β-alanine