Access to Polyfunctionalized Diquinanes, Hydrindanes, and Decalines via TiCl4 Promoted Michael–Aldol and Baylis–Hillman Reactions
摘要:
The addition of 0.5 equiv of TiCl4 to (cyclo)alkanones tethered to alpha,beta-unsaturated ketones afforded polyfunctionalized diquinanes, hydrindanes, and decalines. These products, resulting from a Michael-aldol or a Baylis-Hillman reaction, can be obtained with high or total diastereoselectivity in moderate to high yields. These scaffolds represent interesting building blocks for the synthesis of complex natural products.