One-Flask Tethered Ring Closing Metathesis-Electrocyclic Ring Opening for the Highly Stereoselective Synthesis of Conjugated Z/E-Dienes
作者:Bernd Schmidt、Oliver Kunz
DOI:10.1002/ejoc.201101497
日期:2012.2
A one-flask reaction sequence comprising ringclosing metathesis (RCM) of butenoates derived from allylic alcohols and a base-mediated ringopening gives 2Z,4E-configured dienoic acids in high yields and stereoselectivities. Application of the method to the synthesis of the natural product fusanolide A suggests that the originally published structure was erroneously assigned and should be revised.
包括衍生自烯丙醇的丁烯酸酯的闭环复分解 (RCM) 和碱介导的开环的单瓶反应序列以高产率和立体选择性得到 2Z,4E 构型的二烯酸。该方法在天然产物 fusanolide A 的合成中的应用表明最初发表的结构被错误地分配,应该进行修改。
Diastereoselective construction of anti-4,5-disubstituted-1,3-dioxolanes via a bismuth-mediated two-component hemiacetal oxa-conjugate addition of γ-hydroxy-α,β-unsaturated ketones with paraformaldehyde
作者:Aleksandr Grisin、Samuel Oliver、Michael D. Ganton、John Bacsa、P. Andrew Evans
DOI:10.1039/c5cc01949d
日期:——
The bismuth-mediated two-component hemiacetal oxa-conjugate addition provides a mild method for the stereoselective construction of anti-4,5-disubstituted 1,3-dioxolanes.
Rajesh; Periasamy, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2001, vol. 40, # 10, p. 989 - 993
作者:Rajesh、Periasamy
DOI:——
日期:——
Willems, Bulletin des Societes Chimiques Belges, 1955, vol. 64, p. 409,425, 747, 760
作者:Willems
DOI:——
日期:——
Palladium-Templated Regio- and Stereoselective Cyclization of 2'-Alkenyl 2-Alkynoates and Its Synthetic Applications
作者:Jianguo Ji、Chunming Zhang、Xiyan Lu
DOI:10.1021/jo00110a018
日期:1995.3
2'-Alkenyl 2-alkynoates undergo facile stereoselective cyclization to alpha-(haloalkylidene)-gamma-butyrolactones upon treatment with a catalytic amount of palladium complex in the presence of CuX(2) and LiX. When an alkyl group is introduced to the 1'-position of the alkenyl group, unsubstituted 2-propynoates mainly give trans-beta, gamma-disubstituted gamma-lactones, and substituted 2-propynoates afford cis-beta,gamma-disubstituted gamma-lactones. Further elaborations of the halogen atoms and the synthesis of A-factor using this method are exemplified.