Heterocycle Synthesis Based on Allylic Alcohol Transposition Using Traceless Trapping Groups
作者:Youwei Xie、Paul E. Floreancig
DOI:10.1002/anie.201402010
日期:2014.5.5
Allylic alcohols undergo transposition reactions in the presence of Re2O7 whereby the equilibrium can be dictated by trapping one isomer with a pendent electrophile. Additional ionization can occur when the trapping group is an aldehyde or ketone, thus leading to cyclic oxocarbenium ion formation. Terminating the process through bimolecular nucleophilic addition into the intermediate provides a versatile
烯丙醇在Re 2 O 7的存在下进行转座反应,从而可以通过用一种亲电亲和剂捕获一种异构体来控制平衡。当捕获基团是醛或酮时,可能会发生其他电离,从而导致形成环氧碳鎓离子。通过将双分子亲核加成至中间物来终止该过程,为合成各种含氧杂环化合物提供了一种通用的方法。了解序列中各步骤的相对速率会导致设计反应,从而创建多个具有良好至极佳控制水平的立体中心。
Cascade Approach to Stereoselective Polycyclic Ether Formation: Epoxides as Trapping Agents in the Transposition of Allylic Alcohols
作者:Youwei Xie、Paul E. Floreancig
DOI:10.1002/anie.201208132
日期:2013.1.7
Complexity from simplicity: Polycyclic ethers are synthesized by cascade reactions involving the use of epoxides as electrophilic traps in the transposition of allylic alcohols. Stereogenic centers are created by functionalizing prochiral sites under thermodynamic control, and remote stereoinduction can be achieved through the use of ketones as conduits.
Re<sub>2</sub>
O<sub>7</sub>
-Mediated Dehydrative Cyclization Reactions: Total Synthesis of Herboxidiene and Its 12-Desmethyl Analogue
作者:Tyler M. Rohrs、Qi Qin、Paul E. Floreancig
DOI:10.1002/anie.201705924
日期:2017.8.28
dehydrative cyclization reactions from monoallylic diols, with stereocontrol arising from thermodynamic equilibration. This method was applied to a rapid synthesis of the spliceosome inhibitor herboxidiene. The route was also utilized for the synthesis of an analogue that highlights the importance of a single methyl group in biasing the conformation in the acyclic region of the molecule.
Re 2 O 7催化实现单烯丙基二醇的高效和立体选择性脱水环化反应,并通过热力学平衡产生立体控制。该方法用于剪接体抑制剂除草二烯的快速合成。该途径还用于合成类似物,该类似物突出了单个甲基在偏置分子的无环区域中的构象方面的重要性。
Rh-Catalyzed Kinetic Resolution of Enynes and Highly Enantioselective Formation of 4-Alkenyl-2,3-disubstituted Tetrahydrofurans
作者:Aiwen Lei、Minsheng He、Xumu Zhang
DOI:10.1021/ja0351950
日期:2003.9.1
Rh-catalyzedcycloisomerization of enynes ether with a substituent at the allylic position was examined using (rac)-BINAP, and excellent selectivity was observed. When enantiomerically pure BINAP was used as the ligand, a process that combines kinetic resolution and diastereoselectivity together was developed, in which an enantiomeric product with multiple stereogenic centers was obtained in >99% ee
Synthesis of 1<i>H</i>-Cyclopropa[<i>b</i>]naphthalenes<i>via</i>Trapping of<i>o</i>-Benzoquinodimethanes
作者:Paul Müller、Domingo Rodriguez
DOI:10.1002/hlca.19850680423
日期:1985.6.26
1H-Cyclopropa[b]naphthalene (10a) and 3-methyl or dimethyl derivatives have been synthesized by interception of appropriately substituted o-quinodimethanes 3 with 1-bromo-2-chlorocyclopropene 5, and subsequent dehydrohalogenation of the adducts. The o-quinodimethane derivatives 3 in turn were obtained from the diynes 7via base-induced isomerization to bisallenes 8 and thermal electrocyclic ring closure
通过用1-溴-2-氯环丙烯5拦截适当取代的邻喹啉甲烷3,然后加合物脱氢卤化,合成了1 H-环丙烷[ b ]萘(10a)和3-甲基或二甲基衍生物。所述Ô -quinodimethane衍生物3依次从该二炔得到7通过碱诱导的异构化,以bisallenes 8和热电环化环合。