The synthesis of heliannuol D along with the first synthesis of heliannuol B has been achieved using Mitsunobu reaction and ring-closing metathesis as the key steps. (C) Elsevier Ltd. All rights reserved.
Total synthesis of (±)-heliannuol D, an allelochemical from Helianthus annuus
作者:James R Vyvyan、Ryan E Looper
DOI:10.1016/s0040-4039(99)02284-4
日期:2000.2
The totalsynthesis of (±)-heliannuol D and its epimer has been completed in 9 steps and 12% overall yield from 2-methylanisole. The benzoxepane moiety of the title compound, a common structural feature in the heliannuol family of natural products, is prepared by a biomimetic opening of an epoxide by a phenol.
Synthesis of heliannane skeletons. Facile preparation of (±)-heliannuol D
作者:Francisco A Macı́as、David Chinchilla、José M.G Molinillo、David Marı́n、Rosa M Varela、Ascensión Torres
DOI:10.1016/s0040-4020(03)00134-0
日期:2003.3
Heliannuol D is a natural product with a 7,10-heliannane skeleton, isolated from Helianthus annuus. It has been synthesized in eight steps, in good yield, using a new biomimetic method. Key steps were a Fries rearrangement, a Grignard reaction and, finally, a base catalyzed cyclization.
Synthesis of (±)-Heliannuol D Based on Platinum Catalyzed Regioselective Addition of Arylboronic Acids to Allenes
作者:Kozo Shishido、Mayu Osaka、Makoto Kanematsu、Masahiro Yoshida
DOI:10.3987/com-09-s(s)75
日期:——
An alternative totalsynthesis of (±)-heliannuol D has been achieved in 13 steps and 6.9% overall yield from the arylboronic acid 9. The synthesis applies the previously developed regiocontrolled addition of arylboronic acids to allenes using a platinum catalyst to install the C5 carbon chain on the aryl ring.
(±)-heliannuol D 的替代全合成已通过 13 个步骤实现,芳基硼酸 9 的总产率为 6.9%。该合成应用先前开发的使用铂催化剂将芳基硼酸区域控制加成到丙二烯以安装 C5 碳芳环上的链。
An efficient totalsynthesis of (+)-heliannuol D was accomplished in 14 steps and in 12% overall yield by employing a diastereoselective conjugate addition reaction to create a tertiary benzylic stereogenic center and simple assembly of the functionalized oxepane framework by an efficient one-pot transformation procedure as the key steps.
Concise and efficient enantioselective total syntheses of heliannuols B and D have been accomplished using chirality transfer through a Lewis acid-promoted Claisen rearrangement for the construction of the C7 tertiary stereogenic center and a relay ring-closing metathesis for assembling the dihydrobenzo[b]oxepine backbone of the natural products as the key steps. (C) 2013 Elsevier Ltd. All rights reserved.