Highly efficient synthesis of alka-1,3-dien-2-yltitanium compounds from alka-2,3-dienyl carbonates. A new, practical synthesis of 1,3-dienes and 2-iodo-1,3-dienes
摘要:
Treatment of carbonates of alka-2,3-dien-1-ols 2 with (eta(2)-propene)Ti(O-i-Pr)(2) (I) resulted in oxidative addition to afford 1,3-dien-2-yltitanium compounds 3, which react readily with electrophiles such as H+, I-2 and aldehydes. The reaction with H+ and I-2 proceeds highly regioselectively, thus providing an efficient and practical method for synthesis of 1,3-dienes and 2-iodo-1,3-dienes. Copyright (C) 1996 Elsevier Science Ltd.
Carbometalation–Carboxylation of 2,3-Allenols with Carbon Dioxide: A Dramatic Effect of Halide Anion
作者:Suhua Li、Bukeyan Miao、Weiming Yuan、Shengming Ma
DOI:10.1021/ol4000197
日期:2013.3.1
and stereoselective carbomagnesiation of 2,3-allenols with Grignard reagents may smoothly react with carbon dioxide to afford 2(5H)-furanones. A dramatic effect of the halide anion from the Grignard reagent (Br vs Cl) for CO2 activation was observed. The reaction proceeded smoothly under mild conditions to afford the products in 58–93% yields.
用格氏试剂通过CuCl介导的2,3-烯醇的高度区域选择性和立体选择性碳还原反应形成的环状有机金属中间体可与二氧化碳平稳反应,得到2(5 H)呋喃酮。观察到了来自格氏试剂的卤化物阴离子(Br vs Cl)对CO 2活化的显著作用。反应在温和的条件下平稳进行,以58-93%的收率得到产物。
Battioni,J.-P.; Chodkiewicz,W., Bulletin de la Societe Chimique de France, 1969, p. 911 - 914
作者:Battioni,J.-P.、Chodkiewicz,W.
DOI:——
日期:——
Kleijn, H.; Tigchelaar, M.; Meijer, J., Recueil des Travaux Chimiques des Pays-Bas, 1981, vol. 100, # 9, p. 337 - 341
作者:Kleijn, H.、Tigchelaar, M.、Meijer, J.、Vermeer, P.
DOI:——
日期:——
Vereshchagin,L.I. et al., Journal of Organic Chemistry USSR (English Translation), 1973, vol. 9, p. 514 - 518
作者:Vereshchagin,L.I. et al.
DOI:——
日期:——
Highly efficient synthesis of alka-1,3-dien-2-yltitanium compounds from alka-2,3-dienyl carbonates. A new, practical synthesis of 1,3-dienes and 2-iodo-1,3-dienes
作者:Sentaro Okamoto、Hiroyoshi Sato、Fumie Sato
DOI:10.1016/s0040-4039(96)02126-0
日期:1996.12
Treatment of carbonates of alka-2,3-dien-1-ols 2 with (eta(2)-propene)Ti(O-i-Pr)(2) (I) resulted in oxidative addition to afford 1,3-dien-2-yltitanium compounds 3, which react readily with electrophiles such as H+, I-2 and aldehydes. The reaction with H+ and I-2 proceeds highly regioselectively, thus providing an efficient and practical method for synthesis of 1,3-dienes and 2-iodo-1,3-dienes. Copyright (C) 1996 Elsevier Science Ltd.