钯催化的插羰反应(4)

经典合成反应标准操作—钯催化的插羰反应

with 8 mg of Pd(PPh3)(Cl)2, 40 mg of triphenylphosphme, and 2.0 g of 2-(acetylamino)-5-(1-methylethyl) phenylbromide. The bottle was then evacuated, refilled with argon three times, and charged further with 2.2 mL of deoxygenated tri-n-butylamine and 0.5 mL of deoxygenated water. The apparatus was then pressurized with 3 atm of carbon monoxide, sealed, heated 18 h with stirring at a bath temperature of 120-125 °C, and then allowed to cool. The final pressure was 1.1 atm at 23 °C. Hydrochloric acid (2.4 M) was added to the viscous orange-brown reaction mixture in four 2-mL portions with constant agitation. The crude yield of 2-11 which separated (95% pure by NMR) was 1.63 g (94%). Recrystallization from ethanol-water gave 1.35 g (78%) of a light yellow solid.

4. 插羰反应制备羧酸酯实验操作

OMeI+MeOSPh2-12-2CO+OHOOIPdCl2, K2CO3, PhH120oC, 12 atm., 70%OMeOOMeOISPh2-3OOMeOOMeOOO2-4

A mixture of the iodobenzene 2-1 (0.46 mmol), w-indo alcohol 2-2 (0.83 mmol), K2CO3 (1.38 mmol), and PdCl2 (0.04 mmol) in dry benzene (6 mL) was heated at 120℃ with stirring in an autoclave under carbon monoxide (12 atm) for 16 h. The reaction mixture was filtered and the easter 3 was isolated by column chromatography in 70% yield.

FONNOONNNFBrFFCO, Pd(OAc)2, dppfEt3N, EtOH, 90oCOONFFONNNONFFFOFFF

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经典合成反应标准操作—钯催化的插羰反应

（2R,4S）

-4-{[3,5-Bis(trifluoromethyl)benzyl]-(5-bromopyrimidin-2-yl)}-amino-2-ethyl-6-methoxy-3,4-dihyfro-2H-[1,5]naphthridine-1-carboxylic acid ethyl ester (18 g) is dissolved in N,N-dimethylformamide (60 mL), and thereto are added palladium acetate (611 mg), 1,1’-bis(diphenylphosphino)-ferrocene (3.02 g), ethane (31.7 mL) and triethylamine (37.9 mL). The mixture is purged by carbon monoxide at room temperature for 10 minutes, then is heated at 90 oC and stirred overnight under 40 psi of carbon monoxide. The reaction solution is cooled to room temperature, and thereto is added saturated brine and extracted with ethyl acetate. The organic layer is washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting residue is purified by column chromatography

(silica

gel;

hexane:ethyl

acetate

=

8:1)

to

give

(2R.4S)-4-{[3,5-bis(triflouromethyl)benzyl]-(5-ethoxycarbonylpyrimidin-2-yl)}amino-2-ethyl-6-methoxy-3,4-dihydro-2H-[1,5]naphthyridine-1-carboxylic acid ethyl ester (12.4 g).

OCO, Pd(PPh3)2Cl2NHINONH2Et3N, EtOH, 80oCONONHONH2O

To a stirred solution of 3-(aminocarbonyl)-4-{[3-(methyloxay)penyl]amino}-6-iodoquinoline (1

g)

in

ethanol

(50

mL)

was

added

triethylamine

(0.63

mL)

and

dichlorobis(triphenylphosphine)palladium (II) (0.08 g). The flask was evacuated and refilled with nitrogen three times and then evacuated and refilled with carbon monoxide two times. The mixture was heated at 80oC under an atmosphere of carbon monoxide for 16 h. the mixture was cooled to 20oC and the solvent removed in vacuo. Purification by column chromatography on silica gel, eluting with 9:1 ethyl acetate: cyclohexane, gave the title compound as a pale yellow solid (0.8 g).

NNNNNCO, Pd(dppf)Cl2NaOAc, Methanol, 90oCNONONBr

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经典合成反应标准操作—钯催化的插羰反应

6-bromo-4-[2-(6-methyl-pyridin-2-yl)-5,6-dihydro-4H-pyrrolo[1,2-B]pyrazol-3-yl]-quinoline (22.7 g, 45 mmol) is added to a mixture of sodium acetate (19 g, 230 mmol) and the palladium catalyst [1,1’-bis (diphenylphosphimo) ferrocene] dichloropalladium (II) complex with dichloromethane (1:1) (850 mg, 1.04 mmol) in 130 mL methanol. Place the mixture under 50 psi carbon monoxide atmosphere and stir while warming to 90oC over 1 hour and with constant charging with additional carbon monoxide. Allow the mixture to cool over 8 hours, recharge again with carbon monoxide and heat to 90oC. The pressure may rise to about 75 psi. The reaction is complete in about an hour when the pressure is stable and TLC (1:1 toluene/acetaone) shows no remaining bromide. Partition the mixture between methylene chloride (600 mL) and water (1 L). Extract the aqueous portion with an additional portion of methylene chloride (400 mL). Filter the organic solution through a 300 mL silica plug and wash with 500 mL methylene chloride, 1200 mL ethyl acetate and 1500 mL acetone. Discard the acetone portion. Combine appropriate fractions and concentrate to yield 18.8 g (87.4%) of the desired subtitled intermediate as a pink powder.

ClHNOOHNCO, Pd(OAc)2, dpppIEt3N, CH3OH, DMFOOHOClHNNO

A solution of N-(4-chlorobenzyl)-4-hydroxy-6-iodo-3-quinolinecarboxamide (30.0 g), Et3N (19.1 mL), MeOH (110.6 mL), Pd(OAc)2 (431 mg), and 1,3-bis(diphenylphosphino)propane (791.9 mg) in 375 mL anhydrous DMF is stirred at room temperature until everything dissolves. CO (g) is slowly bubbled through for 2 days and the reaction is maintained at 70oC. The reaction is cooled to room temperature. The product is precipitated by adding 160 mL 1 N HCl into the reaction mixture. An orange solid precipitates is collected. The solid is triturated with EtOAc, filtered, and washed with CH2Cl2 to afford 23.8 g (93 % yield) of the title compound as an off-white solid.

NBocICO, Pd(PPh3)4, Et3NMeOH,CH3CN, 50Psi, 50oCCO2MeNBoc

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经典合成反应标准操作—钯催化的插羰反应

A mixture of 2-(3-iodo-2-methyl-phenyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (26 g, 0.067 mol), Pd(PPh3)4 (2.4 g, 0.002 mol), Et3N (14.3 mL, 0.1 mol), 110 mL of acetonitrile and 50 mL of methanol was stirred under 50 Psi of carbon monoxide at 50 ?C for 8 h. The reaction mixture was filtered and concentrated in vacuo. The residue was dissolved in 250 mL of ethyl acetate, then washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to give crude product, which was purified by column chromatography (petroleum ether: ethyl acetate 30:1 to 10:1) to afford the title product (20 g, 93%) as a gray solid.

OONCO, PdCl2, BINAPEt3N, CH3OH, CH3CNNBrCO2CH3

PdCl2 (18.4 g, 0.104 mol) and BINAP (27.6 g, 0.044 mol) were added to a solution of 5-(2-bromo-phenyl)-oxazole (331.0 g, 0.44 mol) and Et3N (242.2 g, 2.22 mol) in 6 L CH3OH/CH3CN (2:1) in steel bomb. The mixture was stirred at 100 ?C under CO (1 atm) for 48 h. The mixture was filtered and the filtrate was evaporated. The residue was purified by column chromatography (EtOAc/petroleum = 1:10) to give 2-oxazol-5-yl-benzoic acid methyl ester (210.0 g, 70 %) as brown oil.

5. 插羰反应制备酰胺实验操作

OTsOEtONBrONHOR+COPd(Ph3P)4, Bu3N110oC, 69%TsOEtOONNO2-52OOR2-52-A

A mixture of 2-52-A (6.3 mg, 11 rmnol), Pd(PPh3)4 (1.27 g, 1.1 mmol) and n-Bu3N (4.47 g, 24.2 mmol) in toluene (20 mL) was heated under carbon monoxide(10 atm) at 1l0oC for 24 h. Ethyl acetate was added to the reaction mixture and the organic layer was washed with 5% HCl, 5% Na2S2O3, sat. NaHCO3 and then brine, dried over Na2SO4 and evaporated. The

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经典合成反应标准操作—钯催化的插羰反应

residue was purified by column chromatography [ethy1 acetate-CH2Cl2 (1:l)]. The second fraction was 2-52 (3.93 g, 69 %).

6. 插羰反应制备醛

醛可以通过卤化物在不同氢源中的钯催化的插羰反应制备。芳基和烯基碘化物和溴化物在惰性溶剂中，三级胺存在的条件下与CO和H2（1:1）发生插羰反应生成醛。而芳基氯化物要先生成碳酸铬的衍生物后，才能在130oC的温度下转化成醛。甲酸钠可以代替H2被用作氢源来合成醛。氯苯在150oC的温度下，用dippp作为配体，与CO和甲酸钠反应制得苯甲醛。

+CO+H2PdCl2(Ph3P)2Et3N, 75%CHOI

Cl+CO+HCO2NaPd(OAc)2, dippp150C, 20 h, 90%oCHO+NaCl+CO2

用锡的氢化物作为氢源，Pd(Ph3P)4作为催化剂，芳基、烯基卤化物或三氟甲磺酸酯和苄基、烯丙基氯化物的羰基反应也能制备醛。

OTf+CO+Bu3SnHCHOPd(Ph3P)4, THF3 atm., 98%

硅的氢化物也能被用作氢源。重氮盐6-1通过用Et3SiH或PHMS作为氢源，可以高收率快速的转化成邻甲基苯甲醛。

N2BF4+CO+Et3SnHPd(OAc)2, MeCN, Et2Ort., 10 atm., 10 min., 79%CHO6-1

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