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研究内容詳細資料(ポスター形式)
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卓哉 西尾
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【三員環の開環を伴うタンデム型環化付加反応】の反応機構的な研究に関する内容の要約です. 2回目のマイケル付加による環化速度が変化する点が興味深い内容となっております.
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研究内容詳細資料(ポスター形式)
1.
カルバニオンをトリガーとするシクロプロパンの開環と その[3 + 2]アニュレーション(2) 4.
α-アニオン安定化置換基 Z の検討 (1広島大院医薬保,2広島大薬)佐々木 道子1,○西尾 卓哉2,武田 敬1 Sasaki M.; Kondo, Y.; Nishio, T.; Takeda, K. Org. Lett., 2016, 18, 3858-3861. 4. まとめ 25PA-pm091S 1.マイケル受容体としてイリデンマロネートを用いる反応 2. マイケル受容体上の置換基の検討 electrophile conditions 3 4 5 1. LiHMDS, –80 ℃, 5 min 2. 2a, –80 ℃ , 5 min 78% (dr = 81:19) – – 1. 2a 2. LiHMDS, –80 ℃ to rt, 30 min – – 78% (dr = 79:21) 1. LiHMDS, –80 ℃, 5 min 2. 2b, –80 ℃ , 5 min 20% (single isomer) 60% – 1. 2b 2. LiHMDS, –80 ℃ to rt, 25 min – – 58% (dr = 63:37) 1. LiHMDS, –80 ℃, 5 min 2. 2c, –80 ℃ , 5 min – 78% – 1. 2c 2. LiHMDS, –80 ℃ to rt, 70 min – – – Ph MeO2C CO2Me 2a Ph MeO2C CN 2b Ph NC CN 2c conditions 3b 4b 5b –80 °C, 1 min 24% 52% – –80 °C, 5 min 20% 60% – –80 °C, 5 min, then NaOH/H2O-Et2O – 72% – –80 ° to –10 °C, 1h 16% 53% – base yield s.m. LiHMDS 18% 40% NaHMDS decomp. – KHMDS decomp. – p-TolSO2 CO2Et H LiHMDS (1.2 equiv) Ph EWG1 (1.2 equiv) EWG2 EWG2 Ph EtO2C EtO2C Ph EWG2 EWG1 SO2-p-Tol + + THF Ph EtO2C EWG2 EWG1 SO2-p-Tol 1 3 4 5 2 Z time yield transI:cis p-TolSO2 30 min 78% 80:20 P(O)(OMe)2 12 hr 45% trans CN 12 hr 32% trans CO2Et 4.5 hr 77% 71:29 Z time yield transI:cis p-TolSO2 30 min 63% 80:20 P(O)(OMe)2 19 h 9% 58:42 CN 5 h 36% 68:32 CO2Et 7 h 28% 59:41 base 3b 4b 5b s.m. LiHMDS 32% 59% – – NaHMDS 28% 39% – – KHMDS 12% 42% – 12% 3. メチルトシルアセテートの脱離 • マイケル受容体として2b (EWG = CO2Me, CN), 2c (EWG = CN, CN)を用いた場合も多官能性五員 環4が得られる.環化の速度は大きく異なり,2c,2b,2aと,シアノ基の数が多いほど速い. 2cの場合は‒80 ℃ において完全に環化する. • 2b (EWG = CO2Me, CN)を用いた場合,室温まで昇温するとメチルトシルアセテートの脱離が進行し, シアノ基を有するシクロペンテン誘導体5bが得られる. p-TolSO2 CO2Et H Ph EtO2C p-TolSO2 EWG2 O OMe Ph EtO2C CO2Me p-TolSO2 EWG2 Ph EtO2C Ph EWG1 EWG2 LiHMDS THF EtO2C Ph EWG2 EWG1 SO2-p-Tol Ph EtO2C EWG2 EWG1 SO2-p-Tol 4' p-TolSO2 Ph EtO2C EWG2 OMe O EWG1 = CO2Me EWG2 3' 5 cyclization rate 2c > 2b >2a 2 p-TolSO2 CO2Et H EtO2C Ph CN CO2Me SO2-p-Tol + THF –80 °C, 5 min Ph EtO2C CN CO2Me SO2-p-Tol 1 3b 4b 2b (1.2 equiv) base (1.2 equiv) CN Ph EtO2C + 5b CN Ph EtO2CPh EtO2C CN CO2Me SO2-p-Tol 4b 5b base (1.2 equiv) -80 °C to rt 40 min Z CO2Et H LiHMDS (1.2 equiv) Ph MeO2C (1.2 equiv) CO2Me CO2Me Ph EtO2C THF –80 °C to rt 1 5a 2a Z CO2Et H 1. LiHMDS (1.2 equiv), –80 °C, 5 min Ph MeO2C (1.2 equiv), –80 °C to rt CN CN Ph EtO2C THF 1 5b 2b 2. p-TolSO2 CO2Et H CN Ph EtO2C EtO2C Ph CN CO2Me SO2-p-Tol + + THF Ph EtO2C CN CO2Me SO2-p-Tol 1 3b 4b 5b 1. LiHMDS (1.2 equiv) –80 °C, 5 min 2. 2b (1.2 equiv) conditions p-TolSO2 X H LiHMDS (1.2 equiv) THF –80 °C to rt Y MeO2C (1.2 equiv) CO2Me SO2-p-Tol X Y MeO2C CO2Me EtO2C Y CO2Me CO2Me SO2-p-Tol p-TolSO2 Y X CO2Me OMe O Y X p-TolSO2 OMe O O OMe Y X OMe O CO2Me p-TolSO2 CO2Me Y X X = CO2Et, CN Y = Ar, CH3, CH2CH2Ph, iPr, tBu up to 91% (13 examples)
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