wrong product drawn - missing CH2


To create a Ugi product using phenylacetaldehyde, 5-methylfurfurylamine, 2-morpholinoethyl isocyanide, and Boc-Gly-OH.


To an NMR tube was added CDCl3 (500 uL) and phenylacetaldehyde (111 uL, 1mmol) and allowed to sit for 10 minutes. Took HNMR. Added 5-methylfurfuryamine (111 uL, 1 mmol) and allowed to sit for 30 minutes. Took HNMR. Added Boc-Gly-OH (0.175g, 1 mmol) and CDCl3 (141 uL). Allowed to sit for 30 minutes, took HNMR. Added 2-morpholinoethyl isocyanide (137 uL, 1 mmol) to bring solution to approximately 1mL. Allowed to sit for 30 minutes, took HNMR.


HNMR (300Mhz)

38A, 38B, 38C, 38D, 38E1 (can't view these jcamp files)

HNMR (500MHz)





The phenylacetaldehyde has some unexplained peaks in the HNMR spectrum. This is possibly due to contamination or oxidation from exposure to air. After 5-methylfurfurylamine was added the aldehyde peak disappears, however with the contamination in the phenylacetaldehyde, it is hard to tell whether the imine has formed or some other product has formed with the contaminated aldehyde. After adding the acid, the peak at 3.5ppm (s, CH2 from phenylacetaldehyde) disappears. After the isocyanide is added a broad "bump" is seen at 5.2, but it is hard to tell if this is from the -NH group formed in the Ugi product.


Based on the information above, it is hard to determine whether the Ugi product formed. For future experiments it is important to closely monitor all steps of the Ugi Reaction.



20:10 Added d-chloroform and aldehyde to tube. Inverted tube twice.
20:20 Took HNMR (38A)
20:30 Added amine. Inverted tube three times. White solid began to precipitate. Solution looked like a slurry.
21:00 Took HNMR (38B)
21:30 Added Boc-Gly-OH. Inverted tube three times. White precipitate dissolved into solution.
22:10 Took HNMR (38C)
22:20 Added isocyanide. Inverted tube three times.
22:50 Took HNMR (38D)


12:30 Took HNMR (38E1)
12:40 Took CNMR (38E) Changed relaxation time to 20 secs.
17:45 Obtained CMR spectrum (38E)


09:30 Took HNMR (500MHZ, 38F)


Phenylacetaldehyde, InChI=1/C8H8O/c9-7-6-8-4-2-1-3-5-8/h1-5,7H,6H2
2-morpholin ethyl isocyanideInChI=1/C7H12N2O/c1-8-2-3-9-4-6-10-7-5-9/h2-7H2
ugi034 InChI=1/C28H40N4O6/c1-21-10-11-23(37-21)20-32(25(33)19-30-27(35)38-28(2,3)4)24(18-22-8-6-5-7-9-22)26(34)29-12-13-31-14-16-36-17-15-31/h5-11,24H,12-20H2,1-4H3,(H,29,34)(H,30,35)