Cinchona and prolinol ether based catalysts are well known for the Michael addition of unsaturated carbonyl compounds. There are many metal catalysts but I am looking for some other organocatalysts used for the same.
Hi Hiren, you can refer this paper too..Catal. Sci. Technol., 2012, 2, 42–53.
It's a review on organocatalytic asymmetric aldol reactions.
You could try Jørgensen's chiral aminal (Halland, N.; Hansen, T.; Jørgensen, K. A. Angewandte Chemie-International Edition
2003, 42, 4955-4957).
There are examples with the use of a catalytic amount of proline together with 2,5-trans-dimethylpiperazine as stoichiometric additive. Hanessian, S.; Pham, V. Org. Lett., 2000, 2, 2975-2978
There is also the Takemoto thiourea catalyst (JACS, 2005, 127, 119).
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