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Santanu 06-26-2020 corrected by Dr S Dey.pdf
1.
FGI DIS (or Discon.)
2.
DIS
3.
DIS DIS DIS
4.
DIS DIS
5.
DIS (1,5-Dicarbonyl) Avoid Cr(VI) reagent
because it provides cyclohexenone as side pdt. Allylic C-H oxidation pdt.
6.
7.
DIS (1,5-Dicarbonyl) Better this route DIS DIS
8.
9.
PhCHO + MeCOMe DIS DIS Retro-Aldol Retro- Michael
10.
11.
DIS Retro- Aldol DIS Retro- Michael (1,3-Dicarbonyl) DIS Retro- Claisen N CO2Et DIS Retro- Michael MeNH2 +
12.
DIS DIS Retro- Aldol Retro-Michael
13.
1st introduce methylvinyl ketone,
then methyl iodide and then aldol reaction to cyclize 1.Base 2. 1. Base (1 eq.) 2. Me-I
14.
DIS
15.
Reconnection DIS Retro- Diels-Alder DIS Retro- Aldol Reconnection FGI
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