One-Pot Synthesis of 4,5-Dihydro-3,1-benzoxazepine-2(1H)-thiones from 2-(2-Isocyanophenyl)ethanols via the Corresponding Isothiocyanates
摘要:
An efficient method for the preparation of 4,5-dihydro-3,1-benzoxazepine-2(1H)-thiones under mild conditions has been developed. 2-(2-Isocyanophenyl)ethanols, easily accessible by treating 1-isocyano-2-(lithiomethyl)benzenes with aldehydes or ketones, were converted into the corresponding isothiocyanates on treatment with sulfur in the presence of a catalytic amount of selenium and excess triethylamine. These isothiocyanato alcohols were then treated with sodium hydride to give 4,5-dihydro-3,1-benzoxazepine-2(1H)-thione derivatives in one pot.
Synthesis of 2,3-Bis(arylamino)benzofurans and 2,3-Bis(arylimino)-2,3-dihydrobenzofurans by a Lewis Acid Catalyzed Reaction of 2-Aryliminophenols with Aryl Isocyanides
that is based on the reaction of 2-aryliminophenols with aryl isocyanides in the presence of a catalytic amount of boron trifluoride diethyl etherate. The reaction gives 2,3-bis(arylamino)benzofurans, some of which are transformed into 2,3-bis(arylimino)-2,3-dihydrobenzofurans by air oxidation, mostly during workup. benzofurans - o-hydroxybenzylideneamines - isocyanides - boron trifluoride - imidoyl
New indole synthesis starting with o-methylphenyl isocyanides such as o-tolyl, 2,4-xylyl, and 2,6-xylyl isocyanide is described in full detail. Treatment of o-tolylisocyanide with LDA in diglyme at −78 °C generated selectively o-(lithiomethyl)phenyl isocyanide in an almost quantitative yield, which on warming up to room temperature was cyclized to indole after aqueous workup. Similary, 2,4-xylyl and
One-Pot Synthesis of 3-Acyl-2-(alkylsulfanyl)indoles and 2-(Alkylsulfanyl)indole-3-carboxylates from (2-Isocyanophenyl)methyl Ketones or (2-Isocyanophenyl)acetates
An efficient method has been developed for the preparation of 3-acyl-2-(alkylsulfanyl)indoles and ethyl 2-(alkylsulfanyl)indole-3-carboxylates under mild conditions. (2-Iso-cyanophenyl)methyl ketones and ethyl 2-(2-isocyanophenyl)acetates were converted into the corresponding isothiocyanates by treatment with sulfur in the presence of a catalytic amount of selenium. The isothiocyanates were then treated
Novel compounds, their salts and compositions related thereto having activity against mammalian factor Xa are disclosed. The compounds are useful in vitro or in vivo for preventing or treating coagulation disorders.