Highly Diastereoselective Cyclopentane Construction: Enantioselective Synthesis of the Dendrobatid Alkaloid 251F
摘要:
We report the first total synthesis, and thus structural confirmation, of the dendrobatid alkaloid 251F (1), based on the retrosynthetic analysis illustrated (1 <-- <-- 4). Key observations in this synthesis are that both the Rh-mediated cyclization of 1 and the anionic cyclization of 2 proceed with excellent diastereoselectivity.
Highly Diastereoselective Cyclopentane Construction: Enantioselective Synthesis of the Dendrobatid Alkaloid 251F
摘要:
We report the first total synthesis, and thus structural confirmation, of the dendrobatid alkaloid 251F (1), based on the retrosynthetic analysis illustrated (1 <-- <-- 4). Key observations in this synthesis are that both the Rh-mediated cyclization of 1 and the anionic cyclization of 2 proceed with excellent diastereoselectivity.
Predicting the Diastereoselectivity of Rh-Mediated Intramolecular C−H Insertion
作者:Douglass F. Taber、Kamfia K. You、Arnold L. Rheingold
DOI:10.1021/ja9515213
日期:1996.1.1
Rhodium-mediated cyclization of the alpha-diazo ester 1 proceeds with high diastereoselectivity, to give the trisubstituted cyclopentane 5. A computational model (ZINDO and Molecular Mechanics) based on our current mechanistic understanding of the reaction is presented. This model correctly predicts the dominant diastereomer from the cyclization of 1 and the eight (Table 2) other alpha-diazo esters studied thus far.