Stereoselective total synthesis of (+)-cryptofolione and (+)-goniothalamin
摘要:
The stereoselective total synthesis of two naturally occurring alpha-pyrone derivatives (+)-cryptofolione and (+)-goniothalamin has been accomplished via a common intermediate. The synthetic sequence involves the asymmetric reduction of a propargyl ketone and olefin cross-metathesis as the key reactions. (C) 2011 Elsevier Ltd. All rights reserved.
or by Prins cyclization of a trans-cinnamaldehyde with a chiral homoallylic alcohol. Goniothalamin was obtained as a cross-metathesis product of the diacetate and vinyl lactone. lactones - total synthesis - heterocycles - cyclizations - cryptofolione
A concise and straightforward approach to total synthesis of (+)-Strictifolione and formal synthesis of Cryptofolione via a unified strategy
作者:Xiaotong Li、Gaopeng Wang、Zhibin Zhang、Na Wu、Qianqian Yang、Shuangping Huang、Xiaoji Wang
DOI:10.1080/00397911.2019.1580373
日期:2019.4.18
Abstract We describe a concise and straightforward approach to the total syntheses of (+)-Strictifolione and Cryptofolione in the longest linear sequences of four steps and six steps from 3-phenyl propanal and trans-cinnamaldehyde, respectively. The route utilized a titanium tetraisopropoxide/(R)-[1,1'-binaphthalene]-2,2'-diol catalyzed Mukaiyama aldol reaction, indium(0)-promoted Barbier reaction
Synthesis of the Proposed Structure of Cryptoconcatone H
作者:Roderick Bates、Dániel Csókás
DOI:10.1055/s-0037-1609657
日期:2019.1
A synthesis of the proposedstructure of cryptoconcatone H and one diastereoisomer has been achieved, featuring a tandem deprotection–oxa-Michael addition to establish the tetrahydropyran moiety. Comparison of the NMR spectroscopic data confirms that the original structural assignment was incorrect.
已经实现了隐连环酮 H 和一种非对映异构体的拟议结构的合成,其特征是串联脱保护 - 氧杂-迈克尔加成以建立四氢吡喃部分。核磁共振光谱数据的比较证实最初的结构分配是不正确的。