Low-Valent Titanium Induced Carbonyl Coupling Reactions
Low-Valent Titanium Induced Carbonyl Coupling Reactions
Low-Valent Titanium Induced Carbonyl Coupling Reactions
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Table 3. Intramolecular Dicarbinyl <strong>Coupling</strong><br />
Entry Substrate Product Ref.<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
O<br />
H<br />
O<br />
O O<br />
O<br />
O<br />
O O<br />
O<br />
O<br />
S<br />
O<br />
O<br />
O<br />
O O<br />
5. INTRAMOLECULAR KETO ESTER COUPLINGS<br />
1.1 Synthesis of Cyclic Ketones<br />
H<br />
O<br />
H<br />
S<br />
H<br />
55, 56<br />
55<br />
55<br />
55<br />
57<br />
47<br />
58, 59<br />
The examples described thus far have to do with either ketones or aldehydes or both. The<br />
carbonyl coupling reaction has found an interesting extension to ketoester cyclization[19,60].<br />
The mechanism of this reaction is claimed to be the exact analogue of the dicarbonyl coupling<br />
60<br />
21
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