The Cp2ZrCl2-catalyzed cycloalumination of functionally substituted olefins with triethylaluminum
作者:I. R. Ramazanov、R. N. Kadikova、U. M. Dzhemilev
DOI:10.1007/s11172-011-0243-3
日期:2011.8
Reactions of functionally substituted olefins (allylamines, sulfides and ethers, homoallylic alcohols and amines, as well as vinyl ethers) with Et3Al in the presence of Cp2ZrCl2 as a catalyst were studied. Cycloalumination of allylamines occurs with high regioselectivity to furnish after subsequent deuterolysis 4-deutero-2-(deuteromethyl)butyl-substituted amines. Cycloalumination of alkyl allyl sulfide is accompanied by a side process of the C-S bond cleavage. In the case of allyl and vinyl ethers, no cycloalumination products are formed under the reaction conditions. However, the reactions with homoallylic alcohol and amine after deuterolysis gave the corresponding dideutero-containing compounds in good yields.
研究了功能取代的烯烃(烯丙胺、硫化物和醚、高烯丙醇和胺以及乙烯基醚)与 Et3Al 在 Cp2ZrCl2 作为催化剂的情况下的反应。烯丙胺的环铝化以高区域选择性发生,在随后的氘解后提供4-氘代-2-(氘代甲基)丁基取代的胺。烷基烯丙基硫醚的环铝化伴随着C-S键断裂的副过程。在烯丙基醚和乙烯基醚的情况下,在反应条件下不形成环铝化产物。然而,氘解后与高烯丙醇和胺的反应以良好的收率得到相应的含双氘代化合物。