Palladium(0)-Catalyzed Highly Regio- and Stereoselective Addition of Organoboronic Acids with 1,2-Allenylphosphonates Forming Tri- or Tetrasubstituted 1(<i>E</i>)-Alkenylphosphonates
作者:Shengming Ma、Hao Guo、Fei Yu
DOI:10.1021/jo060672t
日期:2006.8.1
A highly regio- and stereoselective palladium(0)-catalyzed addition of organoboronicacids with 1,2-allenylphosphonates in the presence of HOAc forming tri- or tetrasubstituted 1(E)-alkenylphosphonates is reported in this paper. The stereoselectivity is much higher than the reported cases. The effects of different R1, R2, and R3 were studied. A mechanism of this reaction is proposed on the basis of
Highly Selective Synthesis of [(Z)-3-Chloro-2-(phenylselanyl)-1-alkenyl]phosphonates and 2-Ethoxy-4-(phenylselanyl)-2,5-dihydro-1,2-oxaphosphole 2-Oxides by Electrophilic Reaction of 1,2-Alkadienylphosphonates with PhSeCl
作者:Guangke He、Yihua Yu、Chunling Fu、Shengming Ma
DOI:10.1002/ejoc.200900913
日期:2010.1
interesting to note that the stereo-selctivity for the selenochlorination reaction is opposite to that of the iodo- and selenohydroxylation reactions of (allenyl)diphenylphosphane oxides with Cl- acting as the nucleophile. The stereoselectivity of the cyclization reaction is clearly different from that of the selenochlorination reaction.
单取代的 1,2-链二烯基膦酸酯与 PhSeCl 在 THF 或二恶烷/H 2 O (10:1) 中于 70 °C 反应得到硒氯化产物 [(Z)-3-氯-2-(苯基硒基)-1-烯基]膦酸盐具有非常高的化学选择性和立体选择性,而与二取代和三取代的丙二烯基膦酸盐的相同反应仅提供 2-乙氧基-4-(苯基硒基)-2,5-二氢-1,2-氧杂磷酰 2-氧化物。有趣的是,硒氯化反应的立体选择性与(烯丙基)二苯基膦氧化物的碘和硒羟基化反应相反,Cl-作为亲核试剂。环化反应的立体选择性明显不同于硒氯化反应的立体选择性。
Rhodium-Catalyzed Highly Regioselective Hydroformylation-Hydrogenation of 1,2-Allenyl-Phosphine Oxides and -Phosphonates
作者:Hao Guo、Shengming Ma
DOI:10.1002/adsc.200800087
日期:2008.6.9
The rhodium-catalyzedhydroformylation-hydrogenation of 1,2-allenyl-phosphineoxides and -phosphonates is reported in this paper. The regioselectivity was well controlled, affording only saturated linear γ-phosphinyl aldehydes under the standard conditions: (carbonyl)tris(triphenylphosphine)-rhodium hydride [RhH(CO)(PPh3)3] (3 mol%), triphenylphosphine (PPh3) (10 mol%), carbon monoxide (CO) (2.4×106 Pa)
[Pd(Ar-BIAN)(alkene)]-Catalyzed Highly Chemo-, Regio-, and Stereoselective Semihydrogenation of 1,2-Allenyl Phosphonates and Related Compounds
作者:Hao Guo、Zilong Zheng、Fei Yu、Shengming Ma、Alexandre Holuigue、Dorette S. Tromp、Cornelis J. Elsevier、Yihua Yu
DOI:10.1002/anie.200601366
日期:2006.7.24
CuX<sub>2</sub>-Mediated Halolactonization Reaction of Monoesters of 1,2-Allenyl Phosphonic Acids and Their Suzuki Cross-Coupling Reaction
作者:Fei Yu、Xiongdong Lian、Jinbo Zhao、Yihua Yu、Shengming Ma
DOI:10.1021/jo802051r
日期:2009.2.6
(X = Cl, Br) halolactonization of monoesters of 1,2-allenyl phosphonicacids is presented. The reaction proceeded smoothly under the mild condition for differently substituted allenic substrates giving the 4-halo-2,5-dihydro[1,2]oxaphosphole 2-oxides in good yields. The Suzuki cross-coupling reaction of these bromides and even chlorides with organic boronic acids under the catalysis of PdCl2(Sphos)2