期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 350, 期 14-15, 页码 2443-2449出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200800403
关键词
fluorous phase; Morita-Baylis-Hillman reaction; organocatalysis; phosphines; Rauhut-Currier reaction; recycling
资金
- Deutsche Forschungsgemeinschaft [DFG] [GL 300/3-3, GL 300/8-1 (SPP 1179)]
- Welch Foundation
The fluorous phosphine P[(CH2)(3)R-18](3) [1, R-f8 = (CF2)(7)CF3; 10 mol%] catalyzes intramolecular Morita-Baylis-Hillman reaction of O=CH-(CH2)(n)CH=CH(C=O)R [n/R = 2/Ph (2a), 2/S-i-Pr, 3/p-tol] in acetonitrile at 60-72 degrees C. Upon cooling, 1 precipitates and is recycled. The products HOCH-(CH2)(n)CH=C(C=O)R are isolated from the supernatant (78-96%). The educt i-PrS(C=O)CH=CH-(CH2)(2)CH=CH(C=O)S-i-Pr similarly undergoes a Rauhut-Currier reaction to give i-PrS(C=O)CH2CH(CH2)(2)CH=C(C=O)S-i-Pr (71-73%). In the case of 2a, reactions are also conducted in the presence of Teflon (R) tape or Gore-Rastex (R) fiber. The catalyst now precipitates onto the fluoropolymer support, mechanically facilitating recycling. For each reaction, three to five cycles are conducted. HPLC or GC monitoring of the rates show low activity losses, with Gore-Rastex (R) fiber giving better results than Teflon (R) tape, presumably due to a higher surface area.
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