Regio- and stereoselective DDQ-induced oxidative coupling of isochromans and isothiochroman with alcohols
摘要:
2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) induced oxidative coupling of isochromans or isothiochroman and alcohols proceeds in high yield with good regio- and stereochemical control.
DDQ-Induced, Anomeric Specific, and Diastereoselective Benzylic Glycosidation: A Novel Approach to Heterocyclic Anthracycline Antibiotics
作者:Yao-Chang Xu、Elaine Lebeau、Giorgio Attardo、Peter L. Myers、John W. Gillard
DOI:10.1021/jo00096a032
日期:1994.8
A novel and efficient method for the oxidative glycosidation at the heterosubstituted benzylic positions with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) is described. The reaction is stereospecific with 3-substituted isochromans and isothiochroman, as well as diastereoselective with non-3-substituted isochromans. The glycosidation with a mixture of alpha- and beta-anomeric free sugars gives alpha-glycosides with absolute stereochemical control on the anomeric center. The synthetic utility of this novel methodology is demonstrated by a short, efficient, and stereoselective total synthesis of heteroanthracycline antitumor reagents.
(EN) Tricyclic heteronaphthoquinone derivatives, that have antineoplastic activity, are disclosed, together with processes for their synthesis. Some of these antineoplastic compounds have a saccharide moiety. Some members of this structurally distinct group exhibit activity against multiple drug resistant cancer cells.(FR) La présente invention concerne d'une part des dérivés tricycliques d'hétéronaphtoquinone à activité antinéoplasique et d'autre part les procédés de synthèse correspondants. Certains de ces composés antinéoplasiques comportent une fraction saccharide. Certains membres de ce groupe structurellement distinct font preuve d'une activité contre les cellules cancéreuses résistant à plusieurs médicaments.