Catalytic Enantioselective Allyl–Allyl Cross-Coupling with a Borylated Allylboronate
摘要:
Catalytic enantioselective allyl-allyl cross-coupling of a borylated allylboronate reagent gives versatile borylated chiral 1,5-hexadienes. These compounds may be manipulated in a number of useful ways to give functionalized chiral building blocks for asymmetric synthesis.
在80°C的Pt(PPh 3)4存在下,将双(频哪醇)双硼[(Me 4 C 2 O 2)BB(O 2 C 2 Me 4)]加成至各种异戊烯中。C或在50°C下。对于单取代的丙二烯而言,内部双键的加成是主要的,而当使用(c-Hex)3 P和1,1-二取代的丙二烯的空间庞大的膦配体时,区域选择性地获得了末端硼氢化产物。
Enantioselective Construction of Carbocyclic and Heterocyclic Tertiary Boronic Esters by Conjunctive Cross-Coupling Reaction
作者:Xuntong Zhang、Chenpeng Gao、James P. Morken
DOI:10.1021/jacs.3c05815
日期:2023.8.2
Synthesis of stereodefined carbocyclic and heterocyclic tertiary boronic esters is accomplished by performing a conjunctive cross-couplingreaction on preformed cyclic boron ate complexes. Boronates bearing spirocyclic and aryl bicyclic skeletons can be synthesized enantioselectively using a chiral PHOX-ligated Pd catalyst with achiral starting material, while substrates bearing continuous stereogenic