| 摘要 |
H(CH2)2NR2(CH3), (CH2)3NR2(CH3), (R2 = H, CH3) were prepd in 5 steps. (A) 22.0 g methyl-0-toluate and 12 ml t-butanol were condensated in 15.0 g NaH-suspended 50 ml DMF to give 28.1 g E-2-(2-phenylethenyl)benzoate[II . (B) 10.0 g II was reacted in 1000 ml C2H5OH by U.V.lamp to give 6.5 g Z-2-(2-phenylethenyl)benzoate[III . (C) 1.2 g III in 50 ml CHCl3 was cyclized catalytically by 2.26 g (CF3CO)20/4.2 g SnCl4 to give 0.3 g I[R=H; R1 = O .
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