Intramolecular nucleophilic substitutions of co-ordinated aryl halides. A preparation of chromans
作者:Roy P. Houghton、Martyn Voyle、Raymond Price
DOI:10.1039/c39800000884
日期:——
3-(o-Fluorophenyl)propan-1-ol can be cyclised readily to chroman either through chromium tricarbonyl complexes or (as also with substituted fluorophenylpropanols) by the action of the (η6-benzene)(η5-ethyltetramethylcyclopentadienyl)rhodium(III) cation.
Antifungal carbinols having the formula
wherein:
R and R¹ are independently H or CH₃;
X and Y¹ are independently H, 1 to 3 halogens or CF₃; and
X′ and Y are independently H, CH₃, CF₃, OCF₂H, OCH₃ or SCH₃
and their agriculturally and pharmaceutically suitable salts are useful as plant disease control agents.
The compounds may be made e.g. by reacting an appropriate oxirane of formula:
with triazole or its alkali metal salt.
Selective C(sp3)-C(sp2) bond construction is of central interest in chemical synthesis. Despite the success of classic cross-coupling reactions, the cross-dehydrogenative coupling between inert C(sp3)-H and C(sp2)-H bonds represents an attractive alternative toward new C(sp3)-C(sp2) bonds. Herein, we establish a selective inter- and intramolecular C(sp3)-H arylation of alcohols with nondirected arenes