Novel synthesis of 1,3-disubstituted alkyl- and aralkylnaphthalenes from methylenetriphenylphosphorane, 1,1-disubstituted epoxides, paraformaldehyde, and trimethylsilyl triflate
A novel approach toward the synthesis of 3-methylnaphthalenes is achieved by the reaction of 3-methylene-5,5-disubstituted tetrahydrofurans derived from methylenetriphenylphosphorane, 1,1-disubstituted epoxides and paraformaldehyde with trimethylsilyl trifluoromethanesulfonate in the presence of diisopropylethylamine.
Okuma, Kentaro,Hirose, Yoshitaka,Shioji, Kosei
p. 438 - 439
(2007/10/03)
A novel and convenient synthesis of 2-aryl-4-methylenetetrahydrofurans from 2-(trimethylsiloxymethyl)allyltrimethylsilane and acetals
The reaction of acetals with 2-(trimethylsiloxymethyl)allyltrimethylsilane under the influence of the combined use of a catalytic amount of tin(II) halide and acetyl halide affords the corresponding 2-aryl-4-methylenetetrahydrofurans in good yields.
Oriyama,Ishiwata,Sano,Matsuda,Takahashi,Koga
p. 5581 - 5584
(2007/10/03)
3-Methylenetetrahydrofurans and 3-Methylenepyrrolidines by Addition of 2-(Bromozincmethyl)-2-alkenyl Ethers or 2-(Chloromagnesiomethyl)-2-alkenyl Ethers to Aldehydes, Ketones and Imines followed by Pd(0)-Catalyzed Cyclization
Reaction of 2-(bromozincmethyl)-2-alkenyl ethers 1 or 2-(chloromagnesiomethyl)-2-alkenyl ethers 2 with aldehydes, ketones and imines affords the addition products 4 and 8, which undergo Pd(0)-catalyzed cyclization to the 3-methylenetetrahydrofurans 6 (Rs
Louw, Jaap van der,Baan, Juul L. van der,Stichter, Henk,Out, Gerardus J. J.,Kanter, Franciscus J. J. de,et al.
p. 9877 - 9900
(2007/10/02)
3-METHYLENETETRAHYDROFURANS AND 3-METHYLENEPYRROLIDINES BY ADDITION OF 2-BROMOZINCMETHYL-2-PROPENYL ETHERS TO ALDEHYDES, KETONES AND IMINES FOLLOWED BY Pd(0)-CATALYZED CYCLIZATION
Reaction of 2-(benzyloxymethyl)- and 2-(phenoxymethyl)allylzinc bromides 1a and 1b with aldehydes, ketones and imines afforded the addition products 3 and 6, which underwent Pd(0)-catalyzed cyclization to the tetrahydrofurans 4 and pyrrolidines 7.
Louw, J. van der,Baan, J. L. van der,Stichter, H.,Out, G. J. J.,Bickelhaupt, F.,Klumpp, G. W.
p. 3579 - 3580
(2007/10/02)
Reductive Cyclization of 2-ethyl Bromides by a Cobalt Complex, Cobaloxime(I). A New Method for the Synthesis of α-Methylene-γ-butyrolactones
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Okabe, Masami,Abe, Masayoshi,Tada, Masaru
p. 1775 - 1777
(2007/10/02)
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