PROCESS FOR PRODUCTION OF OPTICALLY ACTIVE PHOSPHOROUS COMPOUND
申请人:Han Li-Biao
公开号:US20100174079A1
公开(公告)日:2010-07-08
Disclosed is a process for producing an optically active phosphorus compound having an R- or S-type absolute configuration on phosphorus in a simple manner and at high efficiency, while avoiding racemization.
An optically active phosphorus compound having an R- or S-type absolute configuration on phosphorus represented by the general formula (III) can be produced by reacting an optically active phosphorus compound having an R- or S-type absolute configuration on phosphorus represented by the general formula (I) with a metal compound represented by the general formula (II) and water. (I) wherein R
1
represents a hydrogen atom, analkyl group, a cycloalkyl group, an aralkyl group or an aryl group; and R
2
represents a hydrogen, an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group, alkenyl group, an alkoxy group, an aryloxy group, a heterocyclic ring residue or a silyl-containing group. R
3
M (II) wherein R
3
is the same as R
2
; and M represents a lithium or magnesium halide MgX (X═Cl, Br or I). (III) wherein R
2
and R
3
are as defined above.
diphosphination of arynes with diphosphines has been developed. The reaction of stable aryne precursors, 2-(trimethylsilyl)aryl triflates, with tetraaryldiphosphines proceeds in the presence of fluorine- or carbonate-based activators to deliver the corresponding diphosphinated products, sterically and electronically tuned 1,2-bis(diphenylphosphino)benzene (dppbz) derivatives, which can find wide application
Pd-Catalyzed Asymmetric C–H Bond Activation for the Synthesis of P-Stereogenic Dibenzophospholes
作者:Zhen Li、Zi-Qi Lin、Chao-Guo Yan、Wei-Liang Duan
DOI:10.1021/acs.organomet.9b00216
日期:2019.10.28
Pd-catalyzed asymmetric C–Hbondactivation for the synthesis of P-stereogenic dibenzophospholes was efficiently achieved via two types of catalytic systems. Chiral phosphoric amides/acids as ligands provided the products with up to 5:95 er, and (R)-segphos as ligand resulted in enantioselectivities of up to 98:2.
report a photocatalyzed radical difunctionalization of acetylene for the rapid synthesis of C2-linked phosphine compounds. The reaction was initiated by addition of a phosphinoyl radical, followed by two cascade transformations. One involves a double addition for the formation of DPPE-dioxide analogues and in the other the intermediate vinylphosphine oxide is intercepted by a radical formed from an oxoheterocycle