Rhodium-Catalyzed Linear Cross-Trimerization of Two Different Alkynes with an Alkene and Two Different Alkenes with an Alkyne
作者:Masayuki Kobayashi、Ken Tanaka
DOI:10.1002/chem.201200903
日期:2012.7.23
paths with rhodium: A cationic RhI/H8‐BINAPcomplex has been found to catalyze the linear cross‐trimerization of terminal alkynes, acetylenedicarboxylates, and acrylamides to give substituted trienes. The asymmetric linear cross‐trimerization, giving substituted chiral dienes, has also been achieved by using monosubstituted alkenes and (R)‐BINAP instead of terminal alkynes and H8‐BINAP (see scheme;
与铑的交叉路径:阳离子Rh I / H 8 ‐BINAP络合物可催化末端炔烃,乙炔二羧酸酯和丙烯酰胺的线性交叉三聚反应,生成取代的三烯。还可以通过使用单取代的烯烃和(R)-BINAP代替末端炔烃和H 8 -BINAP(参见方案; H 8 -BINAP = 2,2'-bis )来实现不对称线性交叉三聚,得到取代的手性二烯。(二苯基膦基)-5,5',6,6',7,7',8,8'-八氢-1,1'-联萘基; BINAP = 2,2'-双(二苯基膦基)-1,1'-联萘]]。
Palladium-catalyzed dehydrogenative coupling of terminal alkynes with secondary phosphine oxides
作者:Jia Yang、Tieqiao Chen、Yongbo Zhou、Shuangfeng Yin、Li-Biao Han
DOI:10.1039/c4cc09567g
日期:——
The dehydrogenative coupling of terminal alkynes with secondary phosphine oxides is developed. In the presence of a silver additive, palladium acetate could efficiently catalyze the dehydrocoupling of secondary phosphine oxides with a variety of terminal alkynes to produce the corresponding alkynylphosphine oxides in high yields. A reaction mechanism is proposed.
New securinine analogues have been prepared by semisynthesis. Two series were developed using either Suzuki or Sonogashira cross coupling reactions. The in vitro cytotoxicity of the compounds was assayed against HCT-116 colon cancer cells. The most potent derivatives showed promising growth inhibition on four tumoral cell lines giving a valuable insight on the structure–activity relationship (SAR)
Palladium‐Catalyzed Carbonylative Synthesis of Benzosilinones from (2‐Iodophenyl)Hydrosilanes and Terminal Alkynes
作者:Bo Chen、Xiao‐Feng Wu
DOI:10.1002/adsc.201900432
日期:2019.7.11
procedure for the synthesis of benzosilinones from (2‐iodophenyl)hydrosilanes and terminalalkynes has been developed. With Pd(PPh3)4 as the catalyst and DABCO as the base, various benzosilinones were isolated in good to excellent yields with good functional group tolerance. To the best of our knowledge, this is the first example for the preparation of benzosilinones fromterminalalkynes.
[4 + 2] Annulation Cascades of 2-Bromo-1-arylpropan-1-ones with Terminal Alkynes Involving C–Br/C–H Functionalization
作者:Xuan-Hui Ouyang、Chao Hu、Ren-Jie Song、Jin-Heng Li
DOI:10.1021/acs.orglett.8b01962
日期:2018.8.3
various substituted naphthalenones by copper-catalyzed [4 + 2] annulation cascades of 2-bromo-1-arylpropan-1-ones with terminal alkynes is presented. Employing a Cu(MeCN)4PF4 catalyst and 1,10-phenanthroline (1,10-Phen) ligand enables the formation of three new C–C bonds in a single reaction via [4 + 2] annulation of a 2-bromo-1-arylpropan-1-one with an alkyne followed by α-alkylation with the other