Total syntheses of (±)-frondosin C and (±)-8-epi-frondosin C via a tandem anionic 5-exo dig cyclization–Claisen rearrangement sequence
摘要:
Microwave-assisted anionic 5-exo dig cyclization-Claisen rearrangement sequence has been investigated as a convenient 'one-pot' route to fused cycloheptanoid ring systems. This process was used as the key transformation to construct the tetracyclic framework of frondosin C. Subsequent manipulation of the core allowed the first total syntheses of (+/-)-frondosin C and (+/-)-8-epi-frondosin C in a combined overall yield of 20.8% over 14 steps. (c) 2006 Elsevier Ltd. All rights reserved.
Total syntheses of (±)-frondosin C and (±)-8-epi-frondosin C via a tandem anionic 5-exo dig cyclization–Claisen rearrangement sequence
摘要:
Microwave-assisted anionic 5-exo dig cyclization-Claisen rearrangement sequence has been investigated as a convenient 'one-pot' route to fused cycloheptanoid ring systems. This process was used as the key transformation to construct the tetracyclic framework of frondosin C. Subsequent manipulation of the core allowed the first total syntheses of (+/-)-frondosin C and (+/-)-8-epi-frondosin C in a combined overall yield of 20.8% over 14 steps. (c) 2006 Elsevier Ltd. All rights reserved.
Total syntheses of (±)-frondosin C and (±)-8-epi-frondosin C via a tandem anionic 5-exo dig cyclization–Claisen rearrangement sequence
作者:Xin Li、Robert E. Kyne、Timo V. Ovaska
DOI:10.1016/j.tet.2006.12.057
日期:2007.2
Microwave-assisted anionic 5-exo dig cyclization-Claisen rearrangement sequence has been investigated as a convenient 'one-pot' route to fused cycloheptanoid ring systems. This process was used as the key transformation to construct the tetracyclic framework of frondosin C. Subsequent manipulation of the core allowed the first total syntheses of (+/-)-frondosin C and (+/-)-8-epi-frondosin C in a combined overall yield of 20.8% over 14 steps. (c) 2006 Elsevier Ltd. All rights reserved.