A novel route for the construction of Taxol ABC-ring framework: skeletal rearrangement approach to AB-ring and intramolecular aldol approach to C-ring
摘要:
We report here on the construction of the ABC-ring framework of (+/-)-Taxol using an intramolecular aldol reaction as a key step. AB-ring compound 8 was converted to ketoaldehyde 25 as a precursor of an aldol reaction via introduction of oxygen-functionalities and a methoxycarbony] group, which can be converted to a methyl group, in the proper positions of the B-ring. An aldol reaction of ketoaldehyde with LDA led to the formation of the desired product 27, which corresponds to the ABC-ring framework of (+/-)-Taxol. (c) 2008 Elsevier Ltd. All rights reserved.
We report here on the construction of the ABC-ring framework of (+/-)-Taxol using an intramolecular aldol reaction as a key step. AB-ring compound 8 was converted to ketoaldehyde 25 as a precursor of an aldol reaction via introduction of oxygen-functionalities and a methoxycarbony] group, which can be converted to a methyl group, in the proper positions of the B-ring. An aldol reaction of ketoaldehyde with LDA led to the formation of the desired product 27, which corresponds to the ABC-ring framework of (+/-)-Taxol. (c) 2008 Elsevier Ltd. All rights reserved.
A new route for the construction of the AB-ring core of Taxol
AB-ring core of Taxol was developed utilizing a new skeletal transformation protocol as a pivotal step. The acid-catalyzed rearrangement of the cyclopentenone–allene photoadduct gave a bridged seven-membered ketone, which was easily transformed, using the intramolecular Suzuki reaction and the oxidative cleavage of the vicinal diol, to the bicyclic diketone.