Photochemical [2+2] cycloaddition of cyclicenones to(5R)-5-menthyloxy-2[5H]-furanone
作者:Samuel Bertrand、Norbert Hoffmann、Jean-Pierre Pete
DOI:10.1016/s0040-4020(98)00171-9
日期:1998.5
The [2+2] Photocycloaddition of different cyclic enones to (5R)-5-menthyloxy-2[5H]-furanone is investigated. The diastereoselectivity relative to the chiral acetal centre and the regio and the exo/endo ratios of the products have been determined. By variation of the structure of cyclic enones, the diastereoselectivity could be optimised to . The results lead to the conclusion that the photochemically
The totalsynthesis of panaginsene has been accomplished in 11 linear steps starting from methyl 3,3‐dimethyl‐5‐oxocyclopent‐1‐ene‐1‐carboxylate. The key steps are a Sharpless asymmetric epoxidation and Ti(III)‐mediated reductive epoxide opening‐radical cyclization to construct the chiral quaternary carbon stereocenter followed by a very challenging HWE olefination reaction on an 1,3‐keto aldehyde
Bicyclo[2.2.0]hexene: A Multicyclic Mechanophore with Reactivity Diversified by External Forces
作者:Shihao Ding、Wenkai Wang、Anne Germann、Yiting Wei、Tianyi Du、Jan Meisner、Rong Zhu、Yun Liu
DOI:10.1021/jacs.3c13589
日期:2024.3.6
tool in accessing chemical reactivity and reaction pathways that are distinctive from their thermal counterparts. However, eliciting diversified reaction pathways by activating different constituent chemical bonds from the same mechanophore structure remains challenging. Here, we report the design of a bicyclo[2.2.0]hexene (BCH) mechanophore to leverage its structural simplicity and relatively low molecular
A ring distortion approach for the synthesis of an advanced intermediate en route to rhodomolleins XIV and XLII was described, which led to successful construction of the 5/8/5/5 tetracyclic core framework of the kalmane diterpenoids. Key steps of the strategy include an oxidative dearomatization-induced (ODI)-Diels–Alder cycloaddition, a Dowd–Beckwith rearrangement, and a bioinspired Wagner–Meerwein
描述了一种用于合成玫瑰花素 XIV 和 XLII 的高级中间体的环畸变方法,该方法成功构建了卡门二萜类化合物的 5/8/5/5 四环核心框架。该策略的关键步骤包括氧化脱芳构化诱导(ODI)-Diels-Alder环加成、Dowd-Beckwith重排和生物启发的Wagner-Meerwein重排。
Liu, Hsing-Jang; Ulibarri, Gerardo; Browne, Eric N. C., Canadian Journal of Chemistry, 1992, vol. 70, # 5, p. 1545 - 1554
作者:Liu, Hsing-Jang、Ulibarri, Gerardo、Browne, Eric N. C.