Palladium‐Catalyzed Tail‐to‐Tail Reductive Dimerization of Terminal Alkynes to 2,3‐Dibranched Butadienes
作者:Hongyu Guo、Sheng Zhang、Yang Li、Xiaoqiang Yu、Xiujuan Feng、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/anie.202116870
日期:2022.3.21
a combination of pivalic acid and para-toluenesulfonic acid proved successful in favoring the selective highly chemo- and regioselective tail-to-tail reductive dimerization of terminalalkynes over the competitive head-to-taildimerization pathway. The target reaction, proposed to proceed via a cationic alkenyl palladium intermediate, presents a facile and straightforward approach for accessing 2,3-dibranched
A facile method for the preparation of functionalized 2,3-disubstituted-1,3-butadienes
作者:Lishan Zhu、Reuben D. Ricke
DOI:10.1016/0040-4039(91)80633-h
日期:1991.6
Functionalized 2,3-disubstituted-1,3-butadienes were readily prepared by reacting functionalized organozinc compounds with 1,4-dichloro-2-butyne or 1,4-ditosyloxy-2-butyne mediated by Cu(I) salts.
VANDERESSE R.; FORT Y.; BECKER S.; CAUBERE P., TETRAHEDRON LETT., 27,(1986) N 30, 3517-3520
作者:VANDERESSE R.、 FORT Y.、 BECKER S.、 CAUBERE P.
DOI:——
日期:——
Activation of reducing agents. Sodium hydride containing complex reducing agents 22. New coupling reaction with “nickel doped” complex reducing agent.
Vinyl halides can be coupled by NiCRA-bpy in THF or hexane. Interestingly simply changing the solvent changes the nature of the product : diene in THF, and enyne in hexane.