Table 2.
15 | Substituentsa | Yield (%) | Method I Yield (%)b |
---|---|---|---|
a | e,f = Me; g = PMe; R = Me | 74 | – |
b | e,f = Me; g = PMe; R = Ph | 87 | – |
c | e,f = Me; g = PMe; R = H | 39 | – |
d | e = Me; f,g = PMe; R = Me | 78 | 73 |
e | e = Me; f,g = PMe; R = Ph | 73 | 60 |
f | e = Me; f,g = PMe; R = H | 38 | 63 |
g | e = PMe; f,g = Me; R = Me | 38 | – |
h | e = PMe; f,g = Me; R = Ph | 77 | – |
i | e = PMe; f,g = Me; R = H | 22 | – |
PMe = CH2CH2CO2Me.
see reference 21b.