Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (10): 20260117.doi: 10.7503/cjcu20260117
• Organic Chemistry • Previous Articles Next Articles
YAN Yangli, LI Jinyu, QIN Shicheng, SU Xianbin(
)
Received:2026-03-21
Online:2026-10-10
Published:2026-05-09
Contact:
SU Xianbin
E-mail:davidsu@njtech.edu.cn
Supported by:CLC Number:
TrendMD:
YAN Yangli, LI Jinyu, QIN Shicheng, SU Xianbin. Integrated Tag-assisted Continuous-flow Peptide Synthesis in Green Solvents: Circumventing Solubility Bottlenecks and Minimizing Process Mass Intensity[J]. Chem. J. Chinese Universities, 2026, 47(10): 20260117.
| Reactor type | Entry | Solvent | Temp./℃ | Flow rate, x/(mL·min-1) | Reaction time/h | Conversion c (%) |
|---|---|---|---|---|---|---|
| Batch a | 1 | MeOH | 40 | — | 18.0 | 96.54 |
| 2 | EA | 40 | — | 22.0 | 95.87 | |
| 3 | DCM | 30 | — | 24.0 | 94.73 | |
| 4 | MeOH | 75 | — | 10.0 | >99.99 | |
| 5 | EA | 75 | — | 12.0 | >99.99 | |
| Fixed-bed b (flow) | 6 | DCM | 30 | 5.0 | — | Blockage d |
| 7 | MeOH | 40 | 5.0 | — | Blockage d | |
| 8 | EA | 40 | 5.0 | 8 | 96.29 | |
| 9 | EA | 75 | 5.0 | 6 | >99.99 | |
| 10 | MeOH | 75 | 10.0 | — | Blockage d | |
| 11 | EA | 75 | 10.0 | 3.0 | 98.57 | |
| 12 | EA | 75 | 10.0 | 4.0 | >99.99 |
Table 1 Optimization of Raney Ni-catalyzed hydrogenation conditions for intermediate 3 across different reactor platforms
| Reactor type | Entry | Solvent | Temp./℃ | Flow rate, x/(mL·min-1) | Reaction time/h | Conversion c (%) |
|---|---|---|---|---|---|---|
| Batch a | 1 | MeOH | 40 | — | 18.0 | 96.54 |
| 2 | EA | 40 | — | 22.0 | 95.87 | |
| 3 | DCM | 30 | — | 24.0 | 94.73 | |
| 4 | MeOH | 75 | — | 10.0 | >99.99 | |
| 5 | EA | 75 | — | 12.0 | >99.99 | |
| Fixed-bed b (flow) | 6 | DCM | 30 | 5.0 | — | Blockage d |
| 7 | MeOH | 40 | 5.0 | — | Blockage d | |
| 8 | EA | 40 | 5.0 | 8 | 96.29 | |
| 9 | EA | 75 | 5.0 | 6 | >99.99 | |
| 10 | MeOH | 75 | 10.0 | — | Blockage d | |
| 11 | EA | 75 | 10.0 | 3.0 | 98.57 | |
| 12 | EA | 75 | 10.0 | 4.0 | >99.99 |
| Operating stage | Time/h | Conversion(%) | Catalyst status |
|---|---|---|---|
| Initial stage | 48 | >99.99 | Fresh |
| Steady state | 120 | 99.45 | Stable |
| Deactivation | 150 | 84.59 | Deactivated |
| Deactivation | 180 | 75.24 | Deactivated |
| Post⁃regeneration | 180+ | 95.42 | Regenerated |
Table 2 Stability and regeneration assessment of Raney Ni catalyst in continuous-flow fixed-bed reactor
| Operating stage | Time/h | Conversion(%) | Catalyst status |
|---|---|---|---|
| Initial stage | 48 | >99.99 | Fresh |
| Steady state | 120 | 99.45 | Stable |
| Deactivation | 150 | 84.59 | Deactivated |
| Deactivation | 180 | 75.24 | Deactivated |
| Post⁃regeneration | 180+ | 95.42 | Regenerated |
| Parameter | Coupling module | Deprotection module | Zaiput membrane separator |
|---|---|---|---|
| Material | 316 L | 316 L | OB⁃900 Hydrophobic PTFE membrane |
| External dimension | 6 mm×200 mm | 6 mm×200 mm | 77.0 mm×77.0 mm×29.0 mm |
| Volume/mL | 8.67 | 6.27 | 0.45 |
| tR/s | 52 | 38 | 2.0 |
| Suitable temperature/℃ | -25—200 | -25—200 | <90 |
Table 3 Detailed parameters of static mixing tubular reactor and Zaiput membrane separator
| Parameter | Coupling module | Deprotection module | Zaiput membrane separator |
|---|---|---|---|
| Material | 316 L | 316 L | OB⁃900 Hydrophobic PTFE membrane |
| External dimension | 6 mm×200 mm | 6 mm×200 mm | 77.0 mm×77.0 mm×29.0 mm |
| Volume/mL | 8.67 | 6.27 | 0.45 |
| tR/s | 52 | 38 | 2.0 |
| Suitable temperature/℃ | -25—200 | -25—200 | <90 |
| Entry | Fmoc⁃AA⁃tag | Coupling reagent | Flow rate, x/(mL•min-1) | tRa /s | Conversion b (%) |
|---|---|---|---|---|---|
| 1 | Fmoc⁃Cys(Trt)⁃tag | EDC/HOBt | 4 | 94 | 82.44 |
| 2 | Fmoc⁃Cys(Trt)⁃tag | EDC/HOBt | 10 | 38 | 91.20 |
| 3 | Fmoc⁃Cys(Trt)⁃tag | EDC/HOBt | 20 | 19 | 78.60 |
| 4 | Fmoc⁃Cys(Trt)⁃tag | PyAOP | 4 | 94 | 92.53 |
| 5 | Fmoc⁃Cys(Trt)⁃tag | PyAOP | 10 | 38 | 98.70 |
| 6 | Fmoc⁃Cys(Trt)⁃tag | PyAOP | 20 | 19 | 90.47 |
Table 4 Effects of different flow rates and coupling systems on coupling efficiency(25 °C)
| Entry | Fmoc⁃AA⁃tag | Coupling reagent | Flow rate, x/(mL•min-1) | tRa /s | Conversion b (%) |
|---|---|---|---|---|---|
| 1 | Fmoc⁃Cys(Trt)⁃tag | EDC/HOBt | 4 | 94 | 82.44 |
| 2 | Fmoc⁃Cys(Trt)⁃tag | EDC/HOBt | 10 | 38 | 91.20 |
| 3 | Fmoc⁃Cys(Trt)⁃tag | EDC/HOBt | 20 | 19 | 78.60 |
| 4 | Fmoc⁃Cys(Trt)⁃tag | PyAOP | 4 | 94 | 92.53 |
| 5 | Fmoc⁃Cys(Trt)⁃tag | PyAOP | 10 | 38 | 98.70 |
| 6 | Fmoc⁃Cys(Trt)⁃tag | PyAOP | 20 | 19 | 90.47 |
| Entry | Solvent system(volume ratio) | Temp./℃ | Appearance | Conversion b (%) |
|---|---|---|---|---|
| 1 | DCM | r.t. | Clear | 93.88 |
| 2 | EA | r.t. | Turbid | 87.45 |
| 3 | EA | 40 | Turbid | 95.98 |
| 4 | EA | 60 | Turbid | 97.42 |
| 5 | EA/DMSO(9∶1) | 60 | Clear | 98.54 |
| 6 | EA/DMSO(1∶1) | 60 | Clear | 98.99 |
| 7 | EA/DMF(9∶1) | 60 | Clear | 98.85 |
| 8 | EA/DMF(1∶1) | 60 | Clear | 97.24 |
Table 5 Optimization of solvent system and temperature at a fixed flow rate(10 mL/min)
| Entry | Solvent system(volume ratio) | Temp./℃ | Appearance | Conversion b (%) |
|---|---|---|---|---|
| 1 | DCM | r.t. | Clear | 93.88 |
| 2 | EA | r.t. | Turbid | 87.45 |
| 3 | EA | 40 | Turbid | 95.98 |
| 4 | EA | 60 | Turbid | 97.42 |
| 5 | EA/DMSO(9∶1) | 60 | Clear | 98.54 |
| 6 | EA/DMSO(1∶1) | 60 | Clear | 98.99 |
| 7 | EA/DMF(9∶1) | 60 | Clear | 98.85 |
| 8 | EA/DMF(1∶1) | 60 | Clear | 97.24 |
| Entry | Fmoc⁃AA⁃OH | Flow rate, x/(mL·min-1) | tRa /s | Conversion b (%) | STY/(g·L-1·h-1) |
|---|---|---|---|---|---|
| 1 | Fmoc⁃Arg(Pbf)⁃OH(5) | 10 | 52 | >99.99 | 1.43×104 |
| 2 | Fmoc⁃Cys(Trt)⁃OH(9) | 10 | 52 | >99.99 | 1.75×104 |
| 3 | Fmoc⁃Phe⁃OH(10) | 10 | 52 | >99.99 | 1.85×104 |
Table 6 Verification of the universality of enhanced SMTR under optimal conditions(60 °C, 10 mL/min)
| Entry | Fmoc⁃AA⁃OH | Flow rate, x/(mL·min-1) | tRa /s | Conversion b (%) | STY/(g·L-1·h-1) |
|---|---|---|---|---|---|
| 1 | Fmoc⁃Arg(Pbf)⁃OH(5) | 10 | 52 | >99.99 | 1.43×104 |
| 2 | Fmoc⁃Cys(Trt)⁃OH(9) | 10 | 52 | >99.99 | 1.75×104 |
| 3 | Fmoc⁃Phe⁃OH(10) | 10 | 52 | >99.99 | 1.85×104 |
| Entry | Fmoc⁃AA⁃BTPM | Reagent a | Flow rate, x/(mL•min-1) | Temp./℃ | tRb /s | Conversion c (%) | STY/(g·L-1·h-1) |
|---|---|---|---|---|---|---|---|
| 1 | Fmoc⁃Cys(Trt)⁃BTPM | 10% PPR | 10 | R.t. | 38 | 96.24 | 2.54×104 |
| 2 | Fmoc⁃Cys(Trt)⁃BTPM | 10% PYR | 10 | R.t. | 38 | 97.02 | 2.56×104 |
| 3 | Fmoc⁃Cys(Trt)⁃BTPM | 10% DEA | 10 | R.t. | 38 | 96.33 | 2.55×104 |
| 4 | Fmoc⁃Cys(Trt)⁃BTPM | 20% PPR | 10 | R.t. | 38 | >99.99 | 2.64×104 |
| 5 | Fmoc⁃Cys(Trt)⁃BTPM | 20% DEA | 10 | R.t. | 38 | >99.99 | 2.64×104 |
| 6 | Fmoc⁃Arg(Pbf)⁃BTPM | 10% DEA | 10 | R.t. | 38 | 94.31 | 1.22×104 |
| 7 | Fmoc⁃Arg(Pbf)⁃BTPM | 20% DEA | 10 | R.t. | 38 | >99.99 | 2.83×104 |
| 8 | Fmoc⁃Phe⁃BTPM(10) | 20% DEA | 10 | R.t. | 38 | >99.99 | 1.41×104 |
| 9 | Fmoc⁃Thr(tBu)⁃BTPM(11) | 20% DEA | 10 | R.t. | 38 | >99.99 | 2.07×104 |
Table 7 Evaluation of deprotection protocols in EA/DMSO binary systems
| Entry | Fmoc⁃AA⁃BTPM | Reagent a | Flow rate, x/(mL•min-1) | Temp./℃ | tRb /s | Conversion c (%) | STY/(g·L-1·h-1) |
|---|---|---|---|---|---|---|---|
| 1 | Fmoc⁃Cys(Trt)⁃BTPM | 10% PPR | 10 | R.t. | 38 | 96.24 | 2.54×104 |
| 2 | Fmoc⁃Cys(Trt)⁃BTPM | 10% PYR | 10 | R.t. | 38 | 97.02 | 2.56×104 |
| 3 | Fmoc⁃Cys(Trt)⁃BTPM | 10% DEA | 10 | R.t. | 38 | 96.33 | 2.55×104 |
| 4 | Fmoc⁃Cys(Trt)⁃BTPM | 20% PPR | 10 | R.t. | 38 | >99.99 | 2.64×104 |
| 5 | Fmoc⁃Cys(Trt)⁃BTPM | 20% DEA | 10 | R.t. | 38 | >99.99 | 2.64×104 |
| 6 | Fmoc⁃Arg(Pbf)⁃BTPM | 10% DEA | 10 | R.t. | 38 | 94.31 | 1.22×104 |
| 7 | Fmoc⁃Arg(Pbf)⁃BTPM | 20% DEA | 10 | R.t. | 38 | >99.99 | 2.83×104 |
| 8 | Fmoc⁃Phe⁃BTPM(10) | 20% DEA | 10 | R.t. | 38 | >99.99 | 1.41×104 |
| 9 | Fmoc⁃Thr(tBu)⁃BTPM(11) | 20% DEA | 10 | R.t. | 38 | >99.99 | 2.07×104 |
| Entry | Solvent system(voume ratio) | Vsol./Vwater | Product loss b (%) |
|---|---|---|---|
| 1 | EA/DMSO(9∶1) | 1∶3 | N. D. c |
| 2 | EA/DMSO(1∶1) | 1∶3 | 8.65 |
| 3 | EA/DMF(9∶1) | 1∶3 | N.D.c |
| 4 | EA/DMF(1∶1) | 1∶3 | 7.48 |
Table 8 Assessment of product retention and solvent compatibility during in-line washing a
| Entry | Solvent system(voume ratio) | Vsol./Vwater | Product loss b (%) |
|---|---|---|---|
| 1 | EA/DMSO(9∶1) | 1∶3 | N. D. c |
| 2 | EA/DMSO(1∶1) | 1∶3 | 8.65 |
| 3 | EA/DMF(9∶1) | 1∶3 | N.D.c |
| 4 | EA/DMF(1∶1) | 1∶3 | 7.48 |
| Method | AA a/mol | Coupling reagent a /mol | Time/min | STY/(g·L-1·h-1) | OSC per AA b /(mL⋅mmol-1) | Total PMI c | PMI per AA d |
|---|---|---|---|---|---|---|---|
| SPPS | 3 | 3.6 | 340 | — | 148.8 | 2314 | 463 |
| CF⁃TAPS | 1.05 | 1.2 | 70 | 5.06×104 | 3.8 | 620 | 124 |
Table 9 Comprehensive resource efficiency metrics: comparative analysis of SPPS and CF-TAPS
| Method | AA a/mol | Coupling reagent a /mol | Time/min | STY/(g·L-1·h-1) | OSC per AA b /(mL⋅mmol-1) | Total PMI c | PMI per AA d |
|---|---|---|---|---|---|---|---|
| SPPS | 3 | 3.6 | 340 | — | 148.8 | 2314 | 463 |
| CF⁃TAPS | 1.05 | 1.2 | 70 | 5.06×104 | 3.8 | 620 | 124 |
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