Robinson Annulation-Mechanism and Shortcut, Alpha Halogenation of Enols and Enolates Practice Problems, Aldol Reaction – Principles and Mechanism, Aldol Condensation – Dehydration of Aldol Addition Product, Aldol Addition and Condensation Reactions – Practice Problems, Crossed Aldol And Directed Aldol Reactions, Crossed Aldol Condensation Practice Problems, Acetoacetic Ester Enolates Practice Problems, Michael Reaction: The Conjugate Addition of Enolates, Robinson Annulation, Shortcut, and Retrosynthesis, Dieckmann condensation – An Intramolecular Claisen Reaction, Crossed Claisen and Claisen Variation Reactions. I call it the α-β orientation: To determine the starting materials of a Robinson annulation, you need to cleave the C=C bond and the bond between the β carbon and the carbon to which it is bonded. Let’s put together a complete mechanism for the Robinson annulation: The last step, after the aldol condensation, is an E1CB elimination and the mechanism for this reaction is covered in the aldol condensation post. 22. The retrosynthesis of robinson annulation forms a ketone compound by breaking several carbon-carbon bonds. This required the aldol ring to be cleaved and the nucleophile to … One shortcut to predicting the product of a Robinson annulation reaction is to put the β carbon of the Michael acceptor next to the ɑ position of the Michael donor and the ɑ carbon of the Michael acceptor next to the carbonyl of the Michael donor. Retrosynthetic Analysis. You can also subscribe without commenting. Retrosynthetic Analysis in Robinson Annulation . Luckily these bonds are arranged such that the bond cleavage is easily achieved by drawing a line that bisects both bonds: So, what happens is the Michael product undergoes an intramolecular aldol condensation to form a new six-membered ring. The reaction works mostly for five- and six-memebred ring as these are the most stable. Retrosynthetic Analysis. This may sound too much for a shortcut, but really, all you do is place ɑ and β carbons of the two molecules next to each other to make new bonds. Index of Topics:0:01:23 Retrosynthetic Analysis0:05:17 Problem 8.70:11:18 Robinson Annulation0:21:28 Proposed Synthesis for Problem 8.70:41:45 Danishefsky Synthesis. Organic Chemistry 1 and 2 Summary Sheets – Ace your Exam. UCI Chem 125 Advanced Organic Chemistry (Spring 2016)Lec 22. Required attribution: Nowick, James S., Advanced Organic Chemistry 125 (UCI OpenCourseWare: University of California, Irvine), http://ocw.uci.edu/courses/chem_125_advanced_organic_chemistry.html [Access date].
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