Synthesis of 2-Indol-3-ylbenzofulvenes through a Tandem Reaction Catalyzed by Cationic Gold(I) Complexes
摘要:
A new access to benzofulvenes bearing an indol-3-yl substituent at C-2 has been developed. Treatment of 3-propargylindoles possessing an additional hydroxy group at the other propargylic position with a cationic gold(I) complex triggers a tandem 1,2-indole migration/aura-iso-Nazarov cyclization/elimination sequence that takes place under mild conditions.
(EN) Described are a series of novel photochromic benzopyran and naphthopyran compounds substituted with (1) a cyclopropyl group and (2) a phenyl, substituted phenyl, or 5-member aromatic heterocyclic group at the 2-position of the benzopyran or naphthopyran ring. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic or plano lenses that incorporate the novel pyran compounds or combinations of the novel pyran compounds with other complementary photochromic compounds are described.(FR) On décrit une série de nouveaux composés benzopyraniques et naphthopyraniques photochromiques substitués avec (1) un groupe cyclopropylique et (2) un phényle, un phényle substitué, ou un groupe hétérocyclique aromatique à 5 membres dans la position-2 du cycle benzopyranique ou naphthopyranique. On décrit également des substances hôtes organiques contenant ou revêtues de tels composés. On décrit des articles tels que les lentilles ophthalmiques ou planes incorporant les composés pyraniques nouveaux ou des combinaisons de composés pyraniques nouveaux avec d'autres composés photochromiques.
Ruthenium-Catalyzed Reactions of 1-Cyclopropyl-2-propyn-1-ols with Anilines and Water via Allenylidene Intermediates: Selective Preparation of Tri- and Tetrasubstituted Conjugated Enynes
Ruthenium-catalyzed efficient preparation of the conjugated enynes can be carried out in the reactions of 1-cyclopropyl-2-propyn-1-ols with nitrogen- and oxygen-centered nucleophiles such as anilines and water in the presence of a catalytic amount of sulfur-bridged diruthenium complexes. The use of such complexes as catalysts realizes the completely stereoselective preparation of tri- and tetrasubstituted