Nickel-Catalyzed Regioselective Hydrobenzylation of 1,3-Dienes with Hydrazones
作者:Leiyang Lv、Dianhu Zhu、Zihang Qiu、Jianbin Li、Chao-Jun Li
DOI:10.1021/acscatal.9b02483
日期:2019.10.4
Hydroalkylation of unsaturated hydrocarbons with unstabilized carbonnucleophiles is difficult and remains a major challenge. The disclosed examples so far have mainly focused on the involvement of heteroatom and/or stabilized carbonnucleophiles as efficient reaction partners. Reported here is an unprecedented regioselective nickel-catalyzed hydrobenzylation of 1,3-dienes with hydrazones, generated in situ from
Regio‐ and Diastereoselective Rhodium‐Catalyzed Allylic Substitution with Unstabilized Benzyl Nucleophiles
作者:Debasis Pal、Timothy B. Wright、Ryan O'Connor、P. Andrew Evans
DOI:10.1002/anie.202008071
日期:2021.2.8
rhodium‐catalyzed allylic substitution of challenging alkyl‐substituted secondary allylic carbonates with benzylzinc reagents, which are prepared from widely available benzyl halides. This process utilizes rhodium(III) chloride as a commercially available, high‐oxidation state and bench‐stable pre‐catalyst to provide a rare example of a regio‐ and diastereoselective allylic substitution in the absence of an
Thioacetals are selectively transformed into two types of terminal olefins, one with one-carbon homologation and the other with two-carbon homologation, by treatment with a titanocene(II) species under ethylene. The mode of the reaction is controlled by changing the ligands coordinated to titanocene(II).
Cyclopropanes were obtained by the titanocene(II)-promoted reaction of thioacetals with vinyl pivalate. It was also found that vinycyclopropanes were produced by a similar treatment of thioacetals with the titanocene(II) species in the presence of 1,3-dienes. (C) 2004 Elsevier Ltd. All rights reserved.
Extension of the Bischler-Napieralski reaction—II
作者:S. Sugasawa、S. Ushioda
DOI:10.1016/0040-4020(59)80070-3
日期:1959.1
Acyl derivatives of 4-phenyl-but-3-enylamine on treatment with phosphoryl chloride gave good yields of pyrrolines. Pyridine derivatives were not obtained.