Highly Diastereoselective Synthesis of vicinal Quaternary and Tertiary Stereocenters Using the Iodo-aldol Cyclization
摘要:
The intramolecular iodo-aldol cyclization of alpha-substituted enoate aldehydes and ketones is described. Using prochiral starting materials, the reaction produces hetero- and carbocycles containing quaternary centers adjacent to secondary or tertiary centers. The reactions occur in good yields and are highly selective for the trans-products, having the hydroxyl and iodomethyl groups on opposite faces of the ring system.
A Modular and Diastereoselective 5 + 1 Cyclization Approach to N-(Hetero)Aryl Piperidines
作者:Matthew A. Larsen、Elisabeth T. Hennessy、Madeleine C. Deem、Yu-hong Lam、Josep Saurí、Aaron C. Sather
DOI:10.1021/jacs.9b13114
日期:2020.1.15
A new general de novo synthesis of pharmaceutically important N-(hetero)aryl piperidines is reported. This protocol uses a robustly diastereoselective reductive amination/aza-Michael reaction se-quence to achieve rapid construction of complex polysubstituted ringsystems starting from widely available heterocyclic amine nu-cleophiles and carbonyl electrophiles. Notably, the diastereoselec-tivity of
Highly Diastereoselective Synthesis of <i>vicinal</i> Quaternary and Tertiary Stereocenters Using the Iodo-aldol Cyclization
作者:Frederic Douelle、Amy S. Capes、Michael F. Greaney
DOI:10.1021/ol070482k
日期:2007.5.1
The intramolecular iodo-aldol cyclization of alpha-substituted enoate aldehydes and ketones is described. Using prochiral starting materials, the reaction produces hetero- and carbocycles containing quaternary centers adjacent to secondary or tertiary centers. The reactions occur in good yields and are highly selective for the trans-products, having the hydroxyl and iodomethyl groups on opposite faces of the ring system.