Stereoselective Cascade Reactions that Incorporate a 7-exo Acyl Radical Cyclization
摘要:
Radical cascades that feature a 7-exo acyl radical cyclization followed by a 6-exo or 5-exo alkyl radical cyclization proceed with very good yields and diastereoselectivities. Two stereocenters are created by the reaction, and a single isomeric product was obtained from each of the five substrates examined. The relative configurations of the products are consistent with cyclizations occurring via chairlike or pseudochairlike transition states.
Stereoselective Cascade Reactions that Incorporate a 7-exo Acyl Radical Cyclization
摘要:
Radical cascades that feature a 7-exo acyl radical cyclization followed by a 6-exo or 5-exo alkyl radical cyclization proceed with very good yields and diastereoselectivities. Two stereocenters are created by the reaction, and a single isomeric product was obtained from each of the five substrates examined. The relative configurations of the products are consistent with cyclizations occurring via chairlike or pseudochairlike transition states.
Stereoselective Cascade Reactions that Incorporate a 7-<i>e</i><i>xo</i> Acyl Radical Cyclization
作者:Seth W. Grant、Koudi Zhu、Yu Zhang、Steven L. Castle
DOI:10.1021/ol0604264
日期:2006.4.1
Radical cascades that feature a 7-exo acyl radical cyclization followed by a 6-exo or 5-exo alkyl radical cyclization proceed with very good yields and diastereoselectivities. Two stereocenters are created by the reaction, and a single isomeric product was obtained from each of the five substrates examined. The relative configurations of the products are consistent with cyclizations occurring via chairlike or pseudochairlike transition states.