Reactions of 2-acyloxyisobutyryl halides with nucleosides. 7. Synthesis and biological evaluation of some 2,2'-anhydro-1-(3',5'-di-O-acyl-.beta.-D-arabinofuranosyl)cytosine hydrochlorides
作者:Ernest K. Hamamura、Miroslav Prystasz、Julien P. H. Verheyden、John G. Moffatt、Kenji Yamaguchi、Naomi Uchida、Kosaburo Sato、Akio Nomura、Osamu Shiratori
DOI:10.1021/jm00227a017
日期:1976.5
2'-anhydro-1(beta-D-arabinofuranosyl)cytosine hydrochloride (cycloC) with a homologous series of saturated and unsaturated acyl chlorides in dimethylacetamide has been investigated. Such acylation reactions have made available a considerable number of 3',5'-diesters of cycloC that have been examined for biological activities. The compounds all show cytotoxicity against HeLa cells in tissue culture, and
Total Synthesis of the Cardiotonic Steroid (+)-Cannogenol
作者:Shogo Watanabe、Toshio Nishikawa、Atsuo Nakazaki
DOI:10.1021/acs.joc.0c02966
日期:2021.2.19
The total synthesis of (+)-cannogenol, an aglycon common to various biologically important cardiotonic glycosides, has been achieved. Synthesis of the versatile intermediate involves Mizoroki–Heck and intramolecular Diels–Alder reactions from the enantiomerically pure CD-ring segment, newly prepared in a multidecagram scale this time. Total synthesis by the site-selective transformations of the versatile
Diastereoselective Zwitterionic Aza-Claisen Rearrangement: The Synthesis of Bicyclic Tetrahydrofurans and a Total Synthesis of (+)-Dihydrocanadensolide
作者:Udo Nubbemeyer
DOI:10.1021/jo9600464
日期:1996.1.1
The zwitterionic Claisen rearrangement of optically-active N-allyl pyrrolidines and various acid chlorides proceeds with high simple diastereoselection (internal asymmetric induction) and high 1,2-asymmetric induction, generating a new C-C bond adjacent to a chiral C-O function. The resulting gamma,delta-unsaturated amides were cyclized to the corresponding opticallyactive gamma-butyrolactones, which
The total synthesis of (+/-)-isophellibiline is described. This represents the first synthesis of a member of the nonaromatic homoerythrinan family of alkaloids. The tetracyclic ring system of the natural product was quickly assembled by a strategy that features a retrocycloaddition/cycloaddition reaction of amidodioxin, an intramolecular Heck reaction and a 6 pi-electrocyclic ring closure of a dienoic acid. (C) 2011 Elsevier Ltd. All rights reserved.