Hydroxyl- versus amide-directed cyclopropanation from the allylic position in 1-hydroxy-4-N-acyl-cyclopentenes under modified Simmons-Smith conditions
摘要:
In a functionalized cyclopentene having allylic OH and NH-acyl groups on opposite faces of the ring, the diastereoselective delivery of the incoming methylene group in the diethylzinc version of the Simmons-Smith reaction was completely directed by the NH group. The diastereoselectivity of the reaction can be reversed by complete protection of the amide. (C) 1997, Elsevier Science Ltd.
Hydroxyl- versus amide-directed cyclopropanation from the allylic position in 1-hydroxy-4-N-acyl-cyclopentenes under modified Simmons-Smith conditions
摘要:
In a functionalized cyclopentene having allylic OH and NH-acyl groups on opposite faces of the ring, the diastereoselective delivery of the incoming methylene group in the diethylzinc version of the Simmons-Smith reaction was completely directed by the NH group. The diastereoselectivity of the reaction can be reversed by complete protection of the amide. (C) 1997, Elsevier Science Ltd.