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Ugi NMR Analysis
To synthesize a
from Phenanthrene-9-carboxaldehyde, benzylamine,
-butylisocyanide and Crotonic acid in methanol using Ugi 4CR following
. This is a repeat of
c.The target compound was ranked 155 in the
. The purpose of this experiment is to synthesize an anti-malarial compound based on the inhibition of falcipain-2, as described in this
[The experiment is repeated because the Phenanthrene-9-carboxaldehyde which was used in the previous experiment (Exp143) was acquired as a liquid. The aldehyde used here was obtained from Sigma Aldrich as a solid- Mpt-100C.]
To a one dram vial, charged with methanol (1 ml), benzylamine, phenanthrene-9-carboxaldehyde, crotonic acid and tert-butyl isonitrile (0.5mmol each) was added in that order. After each addition, the resulting solution was vortexed for 15 seconds (or more) and confirmed that a homogeneous solution had been obtained. The vial was capped tight and left at room temperature. After crystallization, the solution was decanted and the crystals were washed with methanol (3x 500uL) and dried under vacuum to obtain 150D in 58.5% yield.
Characterization of 150D:
White powder; H-NMR (
ppm ppm, CDCl3) 1.39 (s, 9H), 1.77 (d, 3H J=6.3Hz), 4.79 (d, 1H, J=17.9 Hz), 4.88 (d, 1H, J=17.9 Hz), 5.67 (s, 1H), 6.18 (d, 1H, J=15.0 Hz), 6.33-6.81 (m, 4H), 6.88-7.23 (m 2H ), 7.36-7.74 (m, 4H), 7.80 (d,1H J=7.3 Hz), 7.90 (s 1H), 8.09 (d 1H J 12.2 Hz), 8.51 (t 2H J=12.8Hz); 13C NMR (
ppm, CDCl3) 18.1, 28.6, 49.0, 50.6, 51.7, 57.6, 94.6, 122.2, 122.4, 122.9, 124.2, 125.8, 126.6, 126.68, 127.1, 127.2, 128.7, 129.3, 130.1, 130.2, 130.4, 130.7, 30.9, 137.3, 143.4, 168.0, 169.9 ; IR (KBr, 1/cm):
= 3323, 3058, 2969, 1677, 1655, 1594, 1526, 1421, 722, 695; HRMS
calcd for C31H32N2O2 : 465.2542 [M+H] found 465.2448; C31H32N2O2Na 487.23614 [M+Na] found 487.23761; yield 59%
ID/ Lib Rank
Mol wt-464.60 g/mol
(solid from Sigma-Aldrich)
Characterization of 150D
X- Ray studies
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6 min after mixing
all components (150A)
15 h after mixing
all components (150B)
17h After mixing
all components (150C)
Until about 15h after mixing all the components, the solution remained clear....however once the solution was disturbed, crystal induction took place. This indicates that the solution had become saturated with the ugi product.
All results are recorded in the
Master Table of all Ugi synthesis attempts
The Ugi product was obtained in 59% yield.
19:30- Charged a vial with 1ml of methanol and began to weigh out the crotonic acid and phenanthrene-9-carboxaldehyde.
19:40- Added 54.61 ul of benzylamine into the vial and vortexted for 15 seconds. A clear solution was achieved.
19:44- Added 103.1 mg of phenanthrene-9-carboxaldehyde to the vial and vortexed for one minute. The solution was light yellow and somewhat cloudy, and the sediment settled to the bottom of the vial. Therefore the solution was vortexed for another three minutes. The solid now went in to the solution, however a few oil like droplets were observed at the bottom of the vial. The solution homogenized upon standing.
20:10- Weighed out and added 43.0 mg of crotonic acid into the vial and vortexed for 30 seconds. The solution became clear.
20:25- Added 56.5 ul of tert-butyl isocyanide to the vial and vortexed for 30 seconds. The solution became cloudy with a few small flakes on the bottom of the vial. It was vortexed for a total of five more minutes before a clear yellow solution was obtained.
20:31 Obtained a picture of the vial (
remember to always label results so you can discuss them
20:35- The vial was left to sit at room temperature for a day.
11:23 Moved the vial to another location and obtained a picture of
, still a clear solution..
12:18 Crystallization has started in.
13:29 Obtained another picture (
19:00 Decanted the clear solution from 150C in to another vial and washed the crystals with methanol (3x500uL), each time vortexing (
) the solution and just decanting the supernatant..(did not centrifuge because the crystals separated out from the supernatant easily)
19:30 Evaporated the methanol under high vac for half an hour.
20:20 Obtained 135.8mg of
19:30 Obtained HNMR of 150D. (62.3mg / 623uL CDCl3)
17:20 Sent 150D for Crystallography studies.
12:30 Obtained IR of 150D. Pulverized 150D (~20mg ) with KBr (~200mg) (spectrograde ) using a tiny mortar-pestle, pressed the powder (mix) in to a pellet. Obtained an IR spectrum on a
Perkin Elmer FTIR -Model: Spectrum One
13:00 Submitted ~5mg of the sample (150D) for MS (FAB) analysis.
14:09 Results from X -ray studies have come.
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