HIGHLY SELECTIVE INTRODUCTION OF CONJUGATED DIENES TO GOOD DIENOPHILES, α,β-UNSATURATED CARBONYL COMPOUNDS AND<i>p</i>-QUINONES, WITHOUT FORMATION OF DIELS–ALDER ADDUCT
The reaction of 2,4-pentadienyltrimethylstannane with α,β-unsaturated carbonylcompounds and p-quinones in the presence of Lewis acid affords the corresponding pentadienylated products in fair to good yield without formation of any Diels–Alder adduct.
Sialidase inhibitors related to zanamivir: Synthesis and biological evaluation of 4H-pyran 6-ether and ketone
作者:Paul W. Smith、J.Ed Robinson、Derek N. Evans、Steven L. Sollis、Peter D. Howes、Naimisha Trivedi、Richard C. Bethell
DOI:10.1016/s0960-894x(99)00031-1
日期:1999.2
Synthesis of 5R-Acetamido-4S-amino-4H-pyran-6R-O-( -ethyl)propyl and 6R-(1-oxo-2-ethyl)butyl 2-carboxylic acids (4 and 5) and their evaluation as inhibitors of influenzavirussialidase is described. Both compounds showed good inhibitoryactivity with marked selectivity for influenza A sialidase.
Direct and regioselective reaction of 2,4-pentadienyltrimethylstannane with 3-acryloyl-5-methoxy-1,4-naphthoqinone afforded a tetracyclic compound, a key precursor for synthesizing 11-deoxyanthracycline antibiotics, by single step.
Synthesis of naturally occuring quinones. Part 20. Tandem Michael/Diels-Alder addition as a new strategy toward tetracyclic systems: synthesis of 11-deoxyanthracyclinones