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- W1972968124 abstract "The Ritter reaction of cyano- and chlorocyanoacetylene with appropriate substrates provided a facile one step synthesis of 4,4-dimethyl-2-ethynyloxazoline (5), 4,4,6-trimethyl-2-ethynyl (7) and -2-chloroethynyl-5,6-dihydro-1,3-oxazine (8), 5,5-dimethyl-3-isopropylidene-2-ethynyl- (10) and -2-chloroethynyl-1-pyrroline (11). On treatment with diazomethane, 7 gave 4,4,6-trimethyl-2-(4-1H-pyrazolyl)- (13) and -2-(3-1H-pyrazolyl)-5,6-dihydro-1,3-oxazine (14) in 42 and 40% yields respectively, while 8 afforded only 4,4,6-trimethyl-2-[3-(4-chloro-1-methyl)-pyrazolyl]-5,6-dihydro-1,3-oxazine (15) in 52% yield. On the other hand, 10 gave 5,5-dimethyl-3-isopropylidene-2-(3-1H-pyrazolyl)-1-pyrroline (16) in 64% yield and 11, 5,5-dimethyl-3-isopropylidene-2-[3-(4-chloro-1-methyl)-pyrazolyl]-1-pyrroline (17) in 16% yield." @default.
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- W1972968124 date "1973-02-01" @default.
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- W1972968124 title "Chemistry of Cyanoacetylenes. Part XIV. One-step Synthesis of Some Ethynyl Heterocycles and Their Reactions with Diazomethane" @default.
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- W1972968124 doi "https://doi.org/10.1246/bcsj.46.540" @default.
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