Dimerization of Butenolide Structures. A Biomimetic Approach to the Dimeric Sesquiterpene Lactones (±)-Biatractylolide and (±)-Biepiasterolide
摘要:
The biomimetic synthesis of the bisesquiterpene lactones (+/-)-biatractylolide 1 and (+/-)-biepiasterolide 2 via dimerization of the captodative stabilized radical 8 is reported. Atractylon 7 has also been shown to be a possible intermediate during the biosynthesis of biatractylolide 1, biepiasterolide 2, atractylolide 3, and hydroxyatractylolide 4.
Regioselectivity of dimerisation of butenolides via captodative stabilised radicaloid intermediates
作者:Sharanjeet K. Bagal、Robert M. Adlington、Rohan A.B. Brown、Jack E. Baldwin
DOI:10.1016/j.tetlet.2005.04.125
日期:2005.7
The regioselective outcome observed during dimerisation of butenolides to dimeric structures via captodative stabilised radicaloids has been studied. The captodative stabilised radicaloids were generated by initial conversion of butenolides to chlorobutenolides via the corresponding hydroxybutenolides, followed by treatment with CoCl(PPh3)3.
Studies towards the biomimetic synthesis of bisesquiterpene lactones
作者:Sharanjeet K Bagal、Robert M Adlington、Rodolfo Marquez、Andrew R Cowley、Jack E Baldwin
DOI:10.1016/s0040-4039(03)01172-9
日期:2003.6
A possible biomimetic connection between atractylolide, hydroxyatractylolide and biatractylolide and biepiasterolide has been demonstrated by efficiently generating the biatractylolide and biepiasterolide core structures from atractylolide and hydroxyatractylolide model butenolides via a radicaloid intermediate in a single step in good yield.
BF<sub>3</sub>·Et<sub>2</sub>O-Mediated annulation of α-keto acids with aliphatic ketones for the synthesis of γ-hydroxy-butenolides and γ-alkylidene-butenolides
Annulation reaction of α-keto acids with cyclic or acyclic aliphatic ketones is reported herein to divergently access γ-hydroxy-butenolides and γ-alkylidene-butenolides depending on the amount of BF3·Et2O. This protocol features good functional tolerance and ease of operation, to open a route to access butenolides via an annulation and dehydration process.
本文报道了 α-酮酸与环状或非环状脂肪族酮的环化反应,根据 BF 3 ·Et 2 O 的量不同地获得 γ-羟基-丁烯内酯和 γ-亚烷基-丁烯内酯。该协议具有良好的功能耐受性和易用性操作,开辟一条通过环化和脱水过程获得丁烯内酯的途径。
Prasad,M. et al., Bulletin de la Societe Chimique de France, 1967, p. 1379 - 1386
作者:Prasad,M. et al.
DOI:——
日期:——
Pedersen, Ove; Christophersen, Carsten; Brehm, Lotte, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1985, vol. 39, # 5, p. 375 - 390