Synthesis of 1-naphthaldehydes via the cascade reactions of 1-phenylpent-4-yn-2-ols promoted by iodine monochloride
作者:Bin Li、Nana Shen、Xuesen Fan、Xinying Zhang
DOI:10.1016/j.tetlet.2016.03.047
日期:2016.4
A novel and convenient synthesis of 1-naphthaldehydes through iodinemonochloride promoted cascade reactions of 1-phenylpent-4-yn-2-ols is presented. Compared with literature procedures, this new method has advantages such as simple operation procedure, mild reaction conditions, good efficiency, and excellent regio-selectivity.
Aiming to introduce this smallest alkyl handle, a highly regioselective peri- and ortho-C–H methylation of 1-naphthaldehyde by using a transient ligand strategy has been developed. A series of methyl-substituted naphthalene frameworks have been prepared in moderate to excellent yields. Mechanistic studies demonstrate that peri-methylation is controlled by the higher electronic density of the peri-position
Palladium‐Catalyzed Regioselective <i>peri</i>‐ and <i>ortho</i>‐Halogenation of 1‐Naphthaldehydes: Application to the Synthesis of Polycyclic Natural Product Skeletons
an imine formation was necessary to achieve C2-halogenation. The mechanism as well as the regioselectivity of the reaction were studied and the halogenated products were used in the synthesis of natural product skeletons.
Derivatives of the allylamine antimycotic terbinafine (1) with varied substitution at the naphthalene ring system have been prepared, and their antifungal activity has been evaluated. In general, the potency is strongly dependent on the bulkiness of the substituent. Only hydrogen or in some cases fluorine are tolerated as substituents at positions 2-4 and 6-8 of the naphthalene moiety, whereas 5-substituents may be larger in size (F, Cl, Br, Me). Derivatives with fluorine at positions 3, 5, and 7 or chlorine at position 5 showed enhanced activity against yeasts relative to 1. This increase in sensitivity could be intensified by simultaneous introduction of two fluoro substituents at positions 5 and 7. Compound 7q demonstrated 8-to 16-fold improved potency against Aspergillus fumigatus, Candida albicans, and Candida parapsilosis.
Formation of monoaldehydes by cerium(IV) ammonium nitrate oxidation of unsymmetric dimethylnaphthalenes
作者:Leiv K. Sydnes、Sissel H. Hansen、Ivan C. Burkow、Leif J. Saethre