四取代的2,3-反式二氢呋喃和呋喃是天然产物、生物有机和药物化学以及材料科学中重要的杂环支架。从常见且容易获得的起始材料开始合成这两种杂环具有挑战性。我们发现,原位生成的脱氧安息香-查耳酮迈克尔加合物在 DMSO 中与分子碘一起加热时发生氧化环化,在 80 °C 下选择性地提供 2,3-反式二氢呋喃,在 120 °C 下选择性地提供呋喃。
A variety of reactions, whilst predicted to be symmetryallowed, are not observed experimentally. Several such non-observed yet allowedreactions have been studied in order to understand them and to possibly bring about, with suitably modified substrates, their observation. For example, although ozone adds to π-bonds, the isoelectronic nitro group does not, due to a high activation energy barrier.
Formation of 1,3,4,5-tetraphenyl-2,6,7-trioxabicyclo[3.2.1]oct-3-ene from the ozonolysis of 1,2,3,4-tetraphenyl-1,3-cyclopentadiene. First [3 + 4] addition of a carbonyl oxide moiety to an .alpha.,.beta.-unsaturated carbonyl group
La reaction du titre conduit egalement au tetraphenyl-1,2,3,5 trioxa-6,7,8bicyclo [3.2.1] octene-2 par une addition [3+2]
La 反应滴定导管法 au tetraphenyl-1,2,3,5 trioxa-6,7,8bicyclo [3.2.1] octene-2 par une add [3+2]
Sulfur-Promoted Oxidative Cyclization of Pentan-1-ones: Direct Access to Tetrasubstituted Furans from Deoxybenzoins and Chalcones
作者:Van Phu Nguyen、Nhu Ngan Ha Nguyen、Nang Duy Lai、Dinh Hung Mac、Pascal Retailleau、Thanh Binh Nguyen
DOI:10.1021/acs.orglett.3c02447
日期:2023.9.1
an important heterocyclic scaffold in natural product, bioorganic, and medicinal chemistry as well as in materials science. The system S8/DABCO/DMSO was found to efficiently mediate the oxidative cyclization of 1,2,3,5-tetraarylpentan-1-ones A, which were obtained in situ as the Michael adducts of chalcones 1 and deoxybenzoins 2, to furan 3. The strategy provided convenient and direct access to tetrasubstituted
呋喃是天然产物、生物有机、药物化学以及材料科学中重要的杂环支架。发现系统 S 8 /DABCO/DMSO 可以有效介导 1,2,3,5-四芳基戊烷-1-酮A的氧化环化,该化合物是作为查尔酮1和脱氧苯偶姻2的迈克尔加合物原位获得的,生成呋喃3 . 该策略提供了从易于获得的具有高官能团耐受性的起始材料中方便、直接地获得四取代呋喃3 的方法。
Mori, Mitsuyuki; Yamakoshi, Hideyuki; Nojima, Masatomo, Journal of the Chemical Society. Perkin transactions I, 1993, # 12, p. 1335 - 1344
作者:Mori, Mitsuyuki、Yamakoshi, Hideyuki、Nojima, Masatomo、Kusabayashi, Shigekazu、McCullough, Kevin J.、et al.